大家帮忙找一下错 谢谢！

#include<iostream>
#include<cmath>
#include<cstdlib>
using namespace std;
int main()
{
int a,b,c,d;
 cin>>a>>b>>c>>d;
 a<=24;b<=60;c<=24;d<=60;
 int e,f,g,h;
 e=60-b; 
 f=a+1;
 g=c-f;
 h=e+d;
 if(h=60) 
 {g=g+1;h=0;
 }
 cout<<g<<" "<<h;
return 0;
}