洛谷 字符替换（计蒜客-T1109）

#include
#include
using namespace std; 
int main(){
	char a[100];
	char change;
	char change_to;
	cin>>a>>change>>change_to;
	for (int i = 0;i < strlen(a);i++){
		if (a[i] == change){
			a[i] = change_to;
		}
	}
	for (int i = 0;i < strlen(a);i++){
		cout << a[i];
	}
    return 0;
}