---
title: 3.1 Addition Operator (+)
description: "The addition operator (`+`) performs arithmetic addition on two operands and produces their sum. It is one of the fundamental arithmetic operators in C++ and is supported for all built-in numeric data types, including integers and floating-point values. When both…"
url: "https://edcret.in/docs/cpp-programming/operators-cplusplus/3-1-addition-operator/"
updated: "2026-07-28"
category: C++ Programming / Operators
---

# 3.1 Addition Operator (+)

The addition operator (`+`) performs arithmetic addition on two operands and produces their sum. It is one of the fundamental arithmetic operators in C++ and is supported for all built-in numeric data types, including integers and floating-point values.

When both operands are integers, the result is an integer. If one or both operands are floating-point values, the operands undergo the usual arithmetic conversions, and the result is a floating-point value.

## Source Code

```
#include <iostream>

int main()
{
    int num1 = 25;
    int num2 = 15;

    int sum = num1 + num2;

    std::cout << "First Number : " << num1 << '\n';
    std::cout << "Second Number: " << num2 << '\n';
    std::cout << "Sum          : " << sum << '\n';

    return 0;
}
```

## Output

```
First Number : 25
Second Number: 15
Sum          : 40
```

## Explanation

- The addition operator (`+`) adds the values of two operands.
- `num1 + num2` evaluates to the sum of the two integer values.
- The resulting value is assigned to the variable `sum`.
- Both operands are of type `int`, so the result is also an integer.
- The value stored in `sum` is displayed using `std::cout`.
- The addition operator can also be used with floating-point data types.
- `return 0;` terminates the program successfully.