小朋友的编程，C++做四则运算

#include<iostream>
using namespace std;
int main(){
    int x,y,z;
    char k;
    cin >> x >> y >> z;
    if(x + y == z)    k = '+';
    else if(x - y == z) k = '-';
    else if(x * y == z) k = '*';
    else k = '/';
    cout << x << k << y << '=' << z << endl;
    return 0;
}