#include <stdio.h>
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "rb")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "wb")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((fread(&ch, sizeof(int), 1, sfp)) > 0){
fwrite(&ch, sizeof(int), 1, dfp);
putchar(ch);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
演習 13-12
#include <time.h>
#include <stdio.h>
char data_file[] = "datetime.bin";
void get_data(){
FILE *fp;
if((fp = fopen(data_file, "rb")) == NULL){
printf("本プラグラムを実行するのは初めてですね\n");
}else{
int year, month, day, h, m, s;
fscanf(fp, "%d%d%d%d%d%d", &year, &month, &day, &h, &m, &s);
printf("前回は%d年%d月%d日%d時%d分%d秒でした\n", year, month, day, h, m, s);
fclose(fp);
}
}
void put_data(){
FILE *fp;
time_t current = time(NULL);
struct tm *timer = localtime(¤t);
if((fp = fopen(data_file, "wb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fprintf(fp, "%d %d %d %d %d %d\n", timer->tm_year + 1900, timer->tm_mon + 1, timer->tm_mday, timer->tm_hour, timer->tm_min, timer->tm_sec);
fclose(fp);
}
}
int main(){
get_data();
put_data();
return 0;
}
#include <stdio.h>
char data_file[] = "datetime.bin";
void get_data(){
FILE *fp;
if((fp = fopen(data_file, "rb")) == NULL){
printf("本プラグラムを実行するのは初めてですね\n");
}else{
int year, month, day, h, m, s;
fscanf(fp, "%d%d%d%d%d%d", &year, &month, &day, &h, &m, &s);
printf("前回は%d年%d月%d日%d時%d分%d秒でした\n", year, month, day, h, m, s);
fclose(fp);
}
}
void put_data(){
FILE *fp;
time_t current = time(NULL);
struct tm *timer = localtime(¤t);
if((fp = fopen(data_file, "wb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fprintf(fp, "%d %d %d %d %d %d\n", timer->tm_year + 1900, timer->tm_mon + 1, timer->tm_mday, timer->tm_hour, timer->tm_min, timer->tm_sec);
fclose(fp);
}
}
int main(){
get_data();
put_data();
return 0;
}
演習 13-11
#include <stdio.h>
int main(){
int i;
FILE *fp;
double data[10];
for(i = 0; i < 10; i++){
data[i] = 3.14159265358979323846;
}
if((fp = fopen("data.bin", "wb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fwrite(data, sizeof(double), 10, fp);
fclose(fp);
}
if((fp = fopen("data.bin", "rb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fread(data, sizeof(double), 10, fp);
for(i = 0; i < 10; i++){
printf("data[%d] = %23.21lf\n", i, data[i]);
}
fclose(fp);
}
return 0;
}
int main(){
int i;
FILE *fp;
double data[10];
for(i = 0; i < 10; i++){
data[i] = 3.14159265358979323846;
}
if((fp = fopen("data.bin", "wb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fwrite(data, sizeof(double), 10, fp);
fclose(fp);
}
if((fp = fopen("data.bin", "rb")) == NULL){
printf("ファイルをオープンできません\n");
}else{
fread(data, sizeof(double), 10, fp);
for(i = 0; i < 10; i++){
printf("data[%d] = %23.21lf\n", i, data[i]);
}
fclose(fp);
}
return 0;
}
演習 13-10
#include <stdio.h>
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
if('A' <= ch && ch <= 'Z'){
ch -= 'A' - 'a';
}
fputc(ch, dfp);
putchar(ch);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
if('A' <= ch && ch <= 'Z'){
ch -= 'A' - 'a';
}
fputc(ch, dfp);
putchar(ch);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
演習 13-9
#include <stdio.h>
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
if('a' <= ch && ch <= 'z'){
ch += 'A' - 'a';
}
fputc(ch, dfp);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
if('a' <= ch && ch <= 'z'){
ch += 'A' - 'a';
}
fputc(ch, dfp);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
演習 13-8
#include <stdio.h>
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
fputc(ch, dfp);
putchar(ch);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
int main(){
int ch;
FILE *sfp;
FILE *dfp;
char sname[FILENAME_MAX];
char dname[FILENAME_MAX];
printf("コピー元ファイル名 : "); scanf("%s", sname);
printf("コピー先ファイル名 : "); scanf("%s", dname);
if((sfp = fopen(sname, "r")) == NULL){
printf("コピー元ファイルをオープンできません\n");
}else{
if((dfp = fopen(dname, "w")) == NULL){
printf("コピー先ファイルをオープンできません\n");
}else{
while((ch = fgetc(sfp)) != EOF){
fputc(ch, dfp);
putchar(ch);
}
fclose(dfp);
}
fclose(sfp);
}
return 0;
}
演習 13-7
#include <stdio.h>
int main(){
int ch, count = 0;
FILE *fp;
char file_name[256];
printf("ファイル名 ： "); scanf("%s", file_name);
if((fp = fopen(file_name, "r")) == NULL){
printf("cannot open a file.\n");
return (-1);
}
while((ch = fgetc(fp)) != EOF){
if('0' <= ch && ch <= '9') count++;
}
printf("数字は%d回文字ありました。\n", count);
return 0;
}
int main(){
int ch, count = 0;
FILE *fp;
char file_name[256];
printf("ファイル名 ： "); scanf("%s", file_name);
if((fp = fopen(file_name, "r")) == NULL){
printf("cannot open a file.\n");
return (-1);
}
while((ch = fgetc(fp)) != EOF){
if('0' <= ch && ch <= '9') count++;
}
printf("数字は%d回文字ありました。\n", count);
return 0;
}
演習 13-6
#include <stdio.h>
int main(){
int ch, count = 0;
FILE *fp;
char file_name[256];
printf("ファイル名 ： "); scanf("%s", file_name);
if((fp = fopen(file_name, "r")) == NULL){
printf("cannot open a file.\n");
return (-1);
}
while((ch = fgetc(fp)) != EOF){
if(ch == '\n') count++;
}
printf("改行は%d回行われていました。\n", count);
return 0;
}
int main(){
int ch, count = 0;
FILE *fp;
char file_name[256];
printf("ファイル名 ： "); scanf("%s", file_name);
if((fp = fopen(file_name, "r")) == NULL){
printf("cannot open a file.\n");
return (-1);
}
while((ch = fgetc(fp)) != EOF){
if(ch == '\n') count++;
}
printf("改行は%d回行われていました。\n", count);
return 0;
}
演習 13-5
#include <time.h>
#include <stdio.h>
char data_file[] = "datetime.dat";
void get_data(){
FILE *fp;
if((fp = fopen(data_file, "r")) == NULL){
printf("本プラグラムを実行するのは初めてですね\n");
}else{
int year, month, day, h, m, s;
char feel[256];
fscanf(fp, "%d%d%d%d%d%d%s", &year, &month, &day, &h, &m, &s, feel);
printf("前回は%d年%d月%d日%d時%d分%d秒で、気分は%sでした\n", year, month, day, h, m, s, feel);
fclose(fp);
}
}
void put_data(){
FILE *fp;
time_t current = time(NULL);
struct tm *timer = localtime(¤t);
char feel[256];
if((fp = fopen(data_file, "w")) == NULL){
printf("ファイルをオープンできません\n");
}else{
printf("今の気分は？:"); scanf("%s", feel);
fprintf(fp, "%d %d %d %d %d %d %s\n", timer->tm_year + 1900, timer->tm_mon + 1, timer->tm_mday, timer->tm_hour, timer->tm_min, timer->tm_sec, feel);
fclose(fp);
}
}
int main(){
get_data();
put_data();
return 0;
}
#include <stdio.h>
char data_file[] = "datetime.dat";
void get_data(){
FILE *fp;
if((fp = fopen(data_file, "r")) == NULL){
printf("本プラグラムを実行するのは初めてですね\n");
}else{
int year, month, day, h, m, s;
char feel[256];
fscanf(fp, "%d%d%d%d%d%d%s", &year, &month, &day, &h, &m, &s, feel);
printf("前回は%d年%d月%d日%d時%d分%d秒で、気分は%sでした\n", year, month, day, h, m, s, feel);
fclose(fp);
}
}
void put_data(){
FILE *fp;
time_t current = time(NULL);
struct tm *timer = localtime(¤t);
char feel[256];
if((fp = fopen(data_file, "w")) == NULL){
printf("ファイルをオープンできません\n");
}else{
printf("今の気分は？:"); scanf("%s", feel);
fprintf(fp, "%d %d %d %d %d %d %s\n", timer->tm_year + 1900, timer->tm_mon + 1, timer->tm_mday, timer->tm_hour, timer->tm_min, timer->tm_sec, feel);
fclose(fp);
}
}
int main(){
get_data();
put_data();
return 0;
}
演習 13-4
#include <stdio.h>
int main(){
FILE *fp;
int select;
char name[100];
double height, weight;
if(((fp = fopen("hw.dat", "w")) == NULL)){
printf("can't open file\n");
return -1;
}
while(true){
printf("名前 身長 体重 : ");
scanf("%s %lf %lf", name, &height, &weight);
fprintf(fp, "%s %.lf %.1lf\n", name, height, weight);
printf("入力を続けますか yes:1/no:0\n"); scanf("%d", &select);
if(select == 0) break;
}
printf("ファイルに書き込みました\n");
return 0;
}
int main(){
FILE *fp;
int select;
char name[100];
double height, weight;
if(((fp = fopen("hw.dat", "w")) == NULL)){
printf("can't open file\n");
return -1;
}
while(true){
printf("名前 身長 体重 : ");
scanf("%s %lf %lf", name, &height, &weight);
fprintf(fp, "%s %.lf %.1lf\n", name, height, weight);
printf("入力を続けますか yes:1/no:0\n"); scanf("%d", &select);
if(select == 0) break;
}
printf("ファイルに書き込みました\n");
return 0;
}
演習 13-3
#include <stdio.h>
#include <string.h>
typedef struct student{
char name[100];
double height;
double weight;
} Student;
void swap_Student(Student *x, Student *y){
Student tmp = *x;
*x = *y;
*y = tmp;
}
void sort_by_name(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(strcmp(a[j - 1].name, a[j].name) > 0) swap_Student(&a[j - 1], &a[j]);
}
}
}
int main(){
FILE *fp;
Student std[256];
int i, ninzu = 0;
double hsum = 0.0;
double wsum = 0.0;
if((fp = fopen("hw.dat", "r")) == NULL){
printf("ファイルをオープンできません\n");
return (-1);
}
while(fscanf(fp, "%s%lf%lf", std[ninzu].name, &std[ninzu].height, &std[ninzu].weight) == 3){
hsum += std[ninzu].height;
wsum += std[ninzu].weight;
ninzu++;
}
sort_by_name(std, ninzu);
for(i = 0; i < ninzu; i++){
printf("%-10s %5.1f %5.1f\n", std[i].name, std[i].height, std[i].weight);
}
printf("----------------------\n");
printf("平均 %5.1f %5.1f\n", hsum / ninzu, wsum / ninzu);
fclose(fp);
return 0;
}
#include <string.h>
typedef struct student{
char name[100];
double height;
double weight;
} Student;
void swap_Student(Student *x, Student *y){
Student tmp = *x;
*x = *y;
*y = tmp;
}
void sort_by_name(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(strcmp(a[j - 1].name, a[j].name) > 0) swap_Student(&a[j - 1], &a[j]);
}
}
}
int main(){
FILE *fp;
Student std[256];
int i, ninzu = 0;
double hsum = 0.0;
double wsum = 0.0;
if((fp = fopen("hw.dat", "r")) == NULL){
printf("ファイルをオープンできません\n");
return (-1);
}
while(fscanf(fp, "%s%lf%lf", std[ninzu].name, &std[ninzu].height, &std[ninzu].weight) == 3){
hsum += std[ninzu].height;
wsum += std[ninzu].weight;
ninzu++;
}
sort_by_name(std, ninzu);
for(i = 0; i < ninzu; i++){
printf("%-10s %5.1f %5.1f\n", std[i].name, std[i].height, std[i].weight);
}
printf("----------------------\n");
printf("平均 %5.1f %5.1f\n", hsum / ninzu, wsum / ninzu);
fclose(fp);
return 0;
}
演習 13-2
#include <stdio.h>
int main(){
FILE *fp;
char filename[256];
printf("ファイル名を入れてください : "); scanf("%s", filename);
fp = fopen(filename, "w");
printf("ファイルの中身を全て消去しました.");
fclose(fp);
return 0;
}
int main(){
FILE *fp;
char filename[256];
printf("ファイル名を入れてください : "); scanf("%s", filename);
fp = fopen(filename, "w");
printf("ファイルの中身を全て消去しました.");
fclose(fp);
return 0;
}
演習 13-1
#include <stdio.h>
int main(){
FILE *fp;
char filename[256];
printf("ファイル名を入れてください : "); scanf("%s", filename);
fp = fopen(filename, "r");
if(fp == NULL){
printf("そのファイルは存在しません\n");
}else{
printf("そのファイルは存在します\n");
fclose(fp);
}
return 0;
}
int main(){
FILE *fp;
char filename[256];
printf("ファイル名を入れてください : "); scanf("%s", filename);
fp = fopen(filename, "r");
if(fp == NULL){
printf("そのファイルは存在しません\n");
}else{
printf("そのファイルは存在します\n");
fclose(fp);
}
return 0;
}
演習 12-5
#include <math.h>
#include <stdio.h>
#define sqr(n) ((n) * (n))
typedef struct{
double x;
double y;
} Point;
typedef struct{
Point pt;
double fuel;
} Car;
double distance_of(Point pa, Point pb){
return sqrt(sqr(pa.x - pb.x) + sqr(pa.y - pb.y));
}
void put_info(Car c){
printf("現在位置 : (%.2f, %.2f)\n", c.pt.x, c.pt.y);
printf("残り燃料 : %.2fリットル\n", c.fuel);
}
int move(Car *c, Point dest){
double d = distance_of(c->pt, dest);
if(d > c->fuel) return 0;
c->pt = dest;
c->fuel -= d;
return 1;
}
int main(){
Car mycar = {{0.0, 0.0}, 90.0};
while(true){
int select;
Point dest;
put_info(mycar);
printf("移動しますか？ yes:1/no:0 -> "); scanf("%d", &select);
if(select != 1) break;
printf("目的地を入力:1 / 移動距離を入力:2 -> "); scanf("%d", &select);
if(select == 1){
printf("目的地のx座標 : "); scanf("%lf", &dest.x);
printf("目的地のy座標 : "); scanf("%lf", &dest.y);
if(!move(&mycar, dest)) printf("移動できません\n");
}else if(select == 2){
printf("x方向の移動距離 : "); scanf("%lf", &dest.x);
printf("y方向の移動距離 : "); scanf("%lf", &dest.y);
dest.x += mycar.pt.x;
dest.y += mycar.pt.y;
if(!move(&mycar, dest)) printf("移動できません\n");
}
}
return 0;
}
#include <stdio.h>
#define sqr(n) ((n) * (n))
typedef struct{
double x;
double y;
} Point;
typedef struct{
Point pt;
double fuel;
} Car;
double distance_of(Point pa, Point pb){
return sqrt(sqr(pa.x - pb.x) + sqr(pa.y - pb.y));
}
void put_info(Car c){
printf("現在位置 : (%.2f, %.2f)\n", c.pt.x, c.pt.y);
printf("残り燃料 : %.2fリットル\n", c.fuel);
}
int move(Car *c, Point dest){
double d = distance_of(c->pt, dest);
if(d > c->fuel) return 0;
c->pt = dest;
c->fuel -= d;
return 1;
}
int main(){
Car mycar = {{0.0, 0.0}, 90.0};
while(true){
int select;
Point dest;
put_info(mycar);
printf("移動しますか？ yes:1/no:0 -> "); scanf("%d", &select);
if(select != 1) break;
printf("目的地を入力:1 / 移動距離を入力:2 -> "); scanf("%d", &select);
if(select == 1){
printf("目的地のx座標 : "); scanf("%lf", &dest.x);
printf("目的地のy座標 : "); scanf("%lf", &dest.y);
if(!move(&mycar, dest)) printf("移動できません\n");
}else if(select == 2){
printf("x方向の移動距離 : "); scanf("%lf", &dest.x);
printf("y方向の移動距離 : "); scanf("%lf", &dest.y);
dest.x += mycar.pt.x;
dest.y += mycar.pt.y;
if(!move(&mycar, dest)) printf("移動できません\n");
}
}
return 0;
}
演習 12-4
#include <stdio.h>
#include <string.h>
#define NAME_LEN 64
typedef struct{
char name[NAME_LEN];
int height;
float weight;
long schols;
} Student;
void swap_Student(Student *x, Student *y){
Student tmp = *x;
*x = *y;
*y = tmp;
}
void sort_by_height(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(a[j - 1].height > a[j].height) swap_Student(&a[j - 1], &a[j]);
}
}
}
void sort_by_name(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(strcmp(a[j - 1].name, a[j].name) > 0) swap_Student(&a[j - 1], &a[j]);
}
}
}
int main(){
int i, n;
Student std[256];
printf("何人の情報を入力しますか？"); scanf("%d", &n);
for(i = 0; i < n; i++){
printf("氏名 : "); scanf("%s", std[i].name);
printf("身長 : "); scanf("%d", &std[i].height);
printf("体重 : "); scanf("%f", &std[i].weight);
printf("奨学金 : "); scanf("%ld", &std[i].schols);
}
printf("身長を昇順にソート:1, 名前を昇順にソート:2 -> "); scanf("%d", &i);
if(i == 1){
sort_by_height(std, n);
printf("身長順にソートしました\n");
}
else if(i == 2){
sort_by_name(std, n);
printf("名前順にソートしました\n");
}
for(i = 0; i < n; i++){
printf("%-8s %6d%6.1f%7ld\n", std[i].name, std[i].height, std[i].weight, std[i].schols);
}
return 0;
}
#include <string.h>
#define NAME_LEN 64
typedef struct{
char name[NAME_LEN];
int height;
float weight;
long schols;
} Student;
void swap_Student(Student *x, Student *y){
Student tmp = *x;
*x = *y;
*y = tmp;
}
void sort_by_height(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(a[j - 1].height > a[j].height) swap_Student(&a[j - 1], &a[j]);
}
}
}
void sort_by_name(Student a[], int n){
int i, j;
for(i = 0; i < n; i++){
for(j = n - 1; j > i; j--){
if(strcmp(a[j - 1].name, a[j].name) > 0) swap_Student(&a[j - 1], &a[j]);
}
}
}
int main(){
int i, n;
Student std[256];
printf("何人の情報を入力しますか？"); scanf("%d", &n);
for(i = 0; i < n; i++){
printf("氏名 : "); scanf("%s", std[i].name);
printf("身長 : "); scanf("%d", &std[i].height);
printf("体重 : "); scanf("%f", &std[i].weight);
printf("奨学金 : "); scanf("%ld", &std[i].schols);
}
printf("身長を昇順にソート:1, 名前を昇順にソート:2 -> "); scanf("%d", &i);
if(i == 1){
sort_by_height(std, n);
printf("身長順にソートしました\n");
}
else if(i == 2){
sort_by_name(std, n);
printf("名前順にソートしました\n");
}
for(i = 0; i < n; i++){
printf("%-8s %6d%6.1f%7ld\n", std[i].name, std[i].height, std[i].weight, std[i].schols);
}
return 0;
}
演習 12-3
#include <stdio.h>
typedef struct xyz{
int x;
long y;
double z;
}xyz;
xyz scan_xyz(){
xyz tmp;
printf("x : "); scanf("%d", &tmp.x);
printf("y : "); scanf("%ld", &tmp.y);
printf("z : "); scanf("%lf", &tmp.z);
return tmp;
}
int main(){
xyz s;
s = scan_xyz();
printf("xyz.x : %d\n", s.x);
printf("xyz.y : %ld\n", s.y);
printf("xyz.z : %lf\n", s.z);
return 0;
}
typedef struct xyz{
int x;
long y;
double z;
}xyz;
xyz scan_xyz(){
xyz tmp;
printf("x : "); scanf("%d", &tmp.x);
printf("y : "); scanf("%ld", &tmp.y);
printf("z : "); scanf("%lf", &tmp.z);
return tmp;
}
int main(){
xyz s;
s = scan_xyz();
printf("xyz.x : %d\n", s.x);
printf("xyz.y : %ld\n", s.y);
printf("xyz.z : %lf\n", s.z);
return 0;
}
演習 12-2
#include <stdio.h>
#define NAME_LEN 64
typedef struct student{
char name[NAME_LEN];
int height;
float weight;
long schols;
}Student;
void hiroko(Student *std){
if(std->height < 180) std->height = 180;
if(std->weight > 80) std->weight = 80;
}
int main(){
Student sanaka;
printf("氏名 : "); scanf("%s", sanaka.name);
printf("身長 : "); scanf("%d", &sanaka.height);
printf("体重 : "); scanf("%f", &sanaka.weight);
printf("奨学金 : "); scanf("%ld", &sanaka.schols);
hiroko(&sanaka);
printf("氏名 = %s\n", sanaka.name);
printf("身長 = %d\n", sanaka.height);
printf("体重 = %.1f\n", sanaka.weight);
printf("奨学金 = %ld\n", sanaka.schols);
return 0;
}
#define NAME_LEN 64
typedef struct student{
char name[NAME_LEN];
int height;
float weight;
long schols;
}Student;
void hiroko(Student *std){
if(std->height < 180) std->height = 180;
if(std->weight > 80) std->weight = 80;
}
int main(){
Student sanaka;
printf("氏名 : "); scanf("%s", sanaka.name);
printf("身長 : "); scanf("%d", &sanaka.height);
printf("体重 : "); scanf("%f", &sanaka.weight);
printf("奨学金 : "); scanf("%ld", &sanaka.schols);
hiroko(&sanaka);
printf("氏名 = %s\n", sanaka.name);
printf("身長 = %d\n", sanaka.height);
printf("体重 = %.1f\n", sanaka.weight);
printf("奨学金 = %ld\n", sanaka.schols);
return 0;
}
演習 12-1
#include <stdio.h>
#define NAME_LEN 64
struct student{
char name[NAME_LEN];
int height;
float weight;
long schols;
};
int main(){
struct student takao = {"Takao", 173, 86.2};
printf("氏名 = %s, adress = %p\n", takao.name, &takao.name);
printf("身長 = %d, adress = %p\n", takao.height, &takao.height);
printf("体重 = %.1f, adress = %p\n", takao.weight, &takao.weight);
printf("奨学金 = %ld, adress = %p\n", takao.schols, &takao.schols);
return 0;
}
#define NAME_LEN 64
struct student{
char name[NAME_LEN];
int height;
float weight;
long schols;
};
int main(){
struct student takao = {"Takao", 173, 86.2};
printf("氏名 = %s, adress = %p\n", takao.name, &takao.name);
printf("身長 = %d, adress = %p\n", takao.height, &takao.height);
printf("体重 = %.1f, adress = %p\n", takao.weight, &takao.weight);
printf("奨学金 = %ld, adress = %p\n", takao.schols, &takao.schols);
return 0;
}
演習 11-10
#include <stdio.h>
int strtoi(const char *nptr){
int num = 0, sign = 1;
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0') break;
num *= 10;
}
return num * sign;
}
long strtol(const char *nptr){
int sign = 1;
long num = 0;
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0') break;
num *= 10;
}
return num * sign;
}
double strtof(const char *nptr){
int sign = 1;
double num = 0;
// 符号の処理
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
// 整数部の処理
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0' || *nptr == '.') break;
num *= 10;
}
// 小数部の処理
if(*nptr == '.'){
*nptr++;
double dec = 1;
while(true){
num += (*nptr - '0') / (dec *= 10);
*nptr++;
if(*nptr == '\0') break;
}
}
return num * sign;
}
int main(){
char str1[256] = "12345";
char str2[256] = "123.45";
printf("str1:%s -> atoi(str1):%d\n", str1, strtoi(str1));
printf("str1:%s -> atol(str1):%ld\n", str1, strtol(str1));
printf("str2:%s -> atof(str2):%lf\n", str2, strtof(str2));
return 0;
}
int strtoi(const char *nptr){
int num = 0, sign = 1;
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0') break;
num *= 10;
}
return num * sign;
}
long strtol(const char *nptr){
int sign = 1;
long num = 0;
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0') break;
num *= 10;
}
return num * sign;
}
double strtof(const char *nptr){
int sign = 1;
double num = 0;
// 符号の処理
if(*nptr == '+'){
sign = 1;
*nptr++;
}else if(*nptr == '-'){
sign = -1;
*nptr++;
}
// 整数部の処理
while(true){
num += *nptr - '0';
*nptr++;
if(*nptr == '\0' || *nptr == '.') break;
num *= 10;
}
// 小数部の処理
if(*nptr == '.'){
*nptr++;
double dec = 1;
while(true){
num += (*nptr - '0') / (dec *= 10);
*nptr++;
if(*nptr == '\0') break;
}
}
return num * sign;
}
int main(){
char str1[256] = "12345";
char str2[256] = "123.45";
printf("str1:%s -> atoi(str1):%d\n", str1, strtoi(str1));
printf("str1:%s -> atol(str1):%ld\n", str1, strtol(str1));
printf("str2:%s -> atof(str2):%lf\n", str2, strtof(str2));
return 0;
}
演習 11-9
#include <stdio.h>
int strlen(const char *s){
int len = 0;
while(*s++) len++;
return len;
}
void strcpy(char *d, const char *s){
while(*d++ = *s++);
}
void strncpy(char *s1, const char *s2, size_t n){
char *tmp = s1;
int len = strlen(s1);
while(n){
*s1++ = *s2++;
n--;
}
*s1++ = '\0';
}
void strcat(char *s1, const char *s2){
while(*s1) *s1++;
while(*s1++ = * s2++);
}
void strncat(char *s1, const char *s2, size_t n){
while(*s1) *s1++;
while(n--) *s1++ = * s2++;
*s1++ = '\0';
}
int strcmp(const char *s1, const char *s2){
while(*s1 == *s2){
if(*s1 == '\0') return 0;
s1++;
s2++;
}
return (unsigned char)*s1 - (unsigned char)*s2;
}
int strncmp(const char *s1, const char *s2, size_t n){
while(n && *s1 && *s2){
if(*s1 != *s2) return (unsigned char)*s1 - (unsigned char)*s2;
s1++;
s2++;
n--;
}
if(!n) return 0;
if(*s1) return 1;
return -1;
}
int main(){
char str1[256] = "abcde";
char str2[256] = "12345";
char str3[256] = "AaBbCcDdEe";
int n = 3;
printf("str1:%s\n", str1);
printf("str2:%s\n", str2);
printf("str1の長さは%dです\n", strlen(str1));
printf("str2をstr1にコピーします\n");
strcpy(str1, str2);
printf("str1:%s\n", str1);
printf("str2の先頭%d文字をstr1にコピーします\n", n);
strncpy(str1, str2, n);
printf("str1:%s\n", str1);
printf("str2をstr1と連結します\n");
strcat(str1, str2);
printf("str1:%s\n", str1);
printf("str2の先頭%d文字をstr1に連結します\n", n);
strncat(str1, str2, n);
printf("str1:%s\n", str1);
printf("str2とstr1を比較します\n");
printf("str1 : str2 ? %d\n", strcmp(str1, str2));
printf("str2とstr1の先頭%d文字を比較します\n", n);
printf("str1 : str2 ? %d\n", strncmp(str1, str2, n));
return 0;
}
int strlen(const char *s){
int len = 0;
while(*s++) len++;
return len;
}
void strcpy(char *d, const char *s){
while(*d++ = *s++);
}
void strncpy(char *s1, const char *s2, size_t n){
char *tmp = s1;
int len = strlen(s1);
while(n){
*s1++ = *s2++;
n--;
}
*s1++ = '\0';
}
void strcat(char *s1, const char *s2){
while(*s1) *s1++;
while(*s1++ = * s2++);
}
void strncat(char *s1, const char *s2, size_t n){
while(*s1) *s1++;
while(n--) *s1++ = * s2++;
*s1++ = '\0';
}
int strcmp(const char *s1, const char *s2){
while(*s1 == *s2){
if(*s1 == '\0') return 0;
s1++;
s2++;
}
return (unsigned char)*s1 - (unsigned char)*s2;
}
int strncmp(const char *s1, const char *s2, size_t n){
while(n && *s1 && *s2){
if(*s1 != *s2) return (unsigned char)*s1 - (unsigned char)*s2;
s1++;
s2++;
n--;
}
if(!n) return 0;
if(*s1) return 1;
return -1;
}
int main(){
char str1[256] = "abcde";
char str2[256] = "12345";
char str3[256] = "AaBbCcDdEe";
int n = 3;
printf("str1:%s\n", str1);
printf("str2:%s\n", str2);
printf("str1の長さは%dです\n", strlen(str1));
printf("str2をstr1にコピーします\n");
strcpy(str1, str2);
printf("str1:%s\n", str1);
printf("str2の先頭%d文字をstr1にコピーします\n", n);
strncpy(str1, str2, n);
printf("str1:%s\n", str1);
printf("str2をstr1と連結します\n");
strcat(str1, str2);
printf("str1:%s\n", str1);
printf("str2の先頭%d文字をstr1に連結します\n", n);
strncat(str1, str2, n);
printf("str1:%s\n", str1);
printf("str2とstr1を比較します\n");
printf("str1 : str2 ? %d\n", strcmp(str1, str2));
printf("str2とstr1の先頭%d文字を比較します\n", n);
printf("str1 : str2 ? %d\n", strncmp(str1, str2, n));
return 0;
}
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