How to make negative numbers not count when doing addition (C++)

Question

i tried making a program like this for schoolwork but it dosent work can somebody help me please, i dont really know where to go

#include <iostream>

using namespace std;

int main()
{
   int a;
   int b;
   int c;
   int d;
   cout<<"enter 3 numbers"<<endl;
   cin>>a;
   cin>>b;
   cin>>c;
   d = a + b + c
   if ( a <= 1 - = 0 )
    cout<<d<<endl;
   if ( b < 1 - = 0 )
   cout<<d<<endl;
   else ( c < 1 - = 0 )



   return 0;

Answer 1

You may want to try something like this:

int d = 0; // Initial value
if (a > 0)
{
    d = d + a;
}
if (b > 0)
{
    d = d + b;
}
if (c > 0)
{
    d = d + c;
}

In the above code, terms are only added to the d variable if they are positive.