cin/cout做法
#include <iostream>
using namespace std;
int main()
{
int A, B, C ,D;
cin >> A >> B >> C >> D ;
cout << "DIFERENCA = " << (A * B - C * D) << endl;
return 0;
}
scanf/printf做法
#include <cstdio>
using namespace std;
int main()
{
int A, B, C ,D;
scanf("%d%d%d%d", &A, &B, &C, &D);
printf("DIFERENCA = %d", A * B - C * D);
return 0;
}