c++中用compare函数比较两个数大小

Question

如题，是老师给的作业，但写出来总有错。帮忙看看
#include
using namespace std;

// 请在此编写compare()函数

//~

void PrintLine(const char* s) {
cout<< s << endl;
}

void main() {
int x, y;
PrintLine("Input X:");
cin>>x;
PrintLine("Input Y:");
cin>>y;

int result = 0;
//result = compare(x, y);
if (result == 0) {
    PrintLine("X is equal to Y.");
} else if (result < 0) {
    PrintLine("X is less than Y.");
} else {
    PrintLine("X is greater than Y.");
}

}

Answer 1

int compare(int a,int b)
{
    if(a<b) return -1;
    if(a>b) return 1;
    else return 0;
}