C++ output shown without returning the values

Question

compiler used-: code blocks

without returning the "c" how is variable "d" getting its value?

#include<iostream>
using namespace std;

int add(int x,int y) {
    int c;
    c=x+y;
}

int main() {
    int a,b;
    cin>>a>>b;
    int d=add(a,b);
    cout<<d;
}

Answer 1

Write this code:

#include<iostream>
using namespace std;

int add(int x,int y)
{
    return x+y;//CHANGE THIS
}

int main()
{
     int a,b;
    cin>>a>>b;
    int d=add(a,b);
    cout<<d;
}