Q:

# C++ program to add two integer numbers using function

In the last program [<a href="https://nerdutella.com/q1120-C-plus-plus-program-to-add-two-integer-numbers" "="" style="box-sizing: border-box; color: rgb(0, 0, 255);" data-mce-href="https://nerdutella.com/q1120-C-plus-plus-program-to-add-two-integer-numbers">C++ program to add two integer numbers], we discussed how to take input and find the sum of two integer numbers?

In this program we are doing the same but using a user defined function, this program will take two integer numbers are calculate the sum/addition of them using a user defined function.

The function addition is used to calculate addition of the numbers, in this program we will pass the entered integer numbers and function will return the addition of the numbers.

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## Program to add two numbers using function in C++

``````#include <iostream>
using namespace std;

//function declaration
int addition(int a,int b);

int main()
{
int num1;	//to store first number
int num2;	//to store second number
int add;	//to store addition

//read numbers
cout<<"Enter first number: ";
cin>>num1;
cout<<"Enter second number: ";
cin>>num2;

//call function
add=addition(num1,num2);

//print addition
cout<<"Addition is: "<<add<<endl;

return 0;
}

//function definition
int addition(int a,int b)
{
return (a+b);
}``````

Output

```Enter first number: 100
Enter second number: 200
Addition is: 300```

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