#include <stdio.h>
int main(void)
{
char str[100];
char x, y, z;
int i, a, b;
a = 0;
for(i = 0; str[i] != '\0'; i++){
a = a + 1;
}
b = 0;
for(i = 0; str[i] != '\0'; i++){
if(str[i] == x){
b = b + 1;
}
}
printf("%sに %c は %d 個\n", str
, x
, b
);
/* printf("y=%c z=%c\n",y,z); */ /* デバッグ用*/
for(i = 0; str[i] != '\0'; i++){
if( str[i] == y){
str[i] = z;
}
}
return 0;
}
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