int in C++ (newbie)

[titounette]

Help i try to built a function which is a sum of two integers
The result must be an integer !
Check the result...
Any help it 's welcome.
/************************************************** ********/
#include <iostream>

#include "math.h"
using namespace std;

int add_number(int a, int b, int c)
{
cout << "enter a" << endl;
cin >>a;
cout << "enter b "<< endl;
cin >> b;
c = a + b;
return (a, b, c);
}

int main ()
{
signed int a, b, c;

add_number(a, b, c);
cout << " the sum is :" << c << endl;
}

[apusateri]

First of all, when you're creating this function, since you're going to ask the user for the inputs, you don't need to include them in your function.

Also, you don't need to return all three values, only the resulting summation (c in your case)

i.e.

 
int addNumber()
{
   int a, b, c;
 
   cout << "enter a" << endl;
   cin >>a;
   cout << "enter b "<< endl;
   cin >> b;
   c = a + b;
   return c;
}
 
int main ()
{
   int sum;
   sum = addNumber();
 
   cout << " the sum is :" << sum << endl;
}
 
 

That should work - let me know if you have any questions. Thanks.

[titounette]

Many thanks. It' s fine!
I made some changes for me.


int addNumber(int a, int b)
{
int c;

cout << "enter a" << endl;
cin >>a;
cout << "enter b "<< endl;
cin >> b;
c = a + b;
return c;
}

int main ()
{
int x, y, sum;
sum = addNumber(x, y);

cout << " the sum is :" << sum << endl;

[apusateri]

Many thanks. It' s fine!
I made some changes for me.


int addNumber(int a, int b)
{
int c;

cout << "enter a" << endl;
cin >>a;
cout << "enter b "<< endl;
cin >> b;
c = a + b;
return c;
}

int main ()
{
int x, y, sum;
sum = addNumber(x, y);

cout << " the sum is :" << sum << endl;

Glad that it worked for you.

FYI, however

nt  x, y, sum;
   sum = addNumber(x, y);
 

You don't need to declare x or y, or pass them to the function, as you are obtaining the values for those two numbers within the function itself. Declaring x and y, and then passing them to the function, doesn't actually do anything useful for the program.

Just a side note, glad I could help!

[dynamicleo]

You can used this way:

#include <iostream>
 
#include "math.h"
using namespace std;
 
void add_number(int &a, int &b, int &c)
{
    cout << "enter a" << endl;
    cin >>a;
 
    cout << "enter b "<< endl;
    cin >> b;
 
    c = a + b;
    // return (a, b, c);
}
 
void main ()
{
    int a, b, c;
 
    add_number(a, b, c);
 
    cout << " the sum is :" << c << endl;
}