>>45
#include <stdio.h>

int main()
{
int i;
char s1[] = {'H','e','l','l','o',',','w','o','r','l','d'};
char s2[] = {72,101,108,108,111,44,119,111,114,108,100};
char s3[] = "Hello,world";
for (i = 0; i < sizeof(s1); i++)
printf("%d ", s1[i]);
printf("\n");
for (i = 0; i < sizeof(s2); i++)
printf("%d ", s2[i]);
printf("\n");
for (i = 0; i < sizeof(s3); i++)
printf("%d ", s3[i]);
printf("\n");

return 0;
}
これを実行してみて