演習 4-20

#include <stdio.h>

int main(){

int i, j;

printf("   |");

for (i = 1; i <= 9; i++){
printf("  %d",i);
}
printf("\n");
printf("---+------------------------------\n");
for (i = 1; i <= 9; i++){
printf(" %d |", i);
for (j = 1; j <= 9; j++){
printf("%3d", i*j);
}
puts("");
}
return 0;
}