# C Operators

## Operators

Operators are used to perform operations on variables and values.

In the example below, we use the
`+`

**operator** to add together two values:

Although the `+`

operator is often used to add together two values, like in the example above, it can also be used to add together a variable and a value, or a variable and another variable:

### Example

```
int sum1 = 100 + 50;
// 150 (100 + 50)
```

int sum2 = sum1 + 250; // 400 (150 + 250)

int sum3 = sum2 + sum2; // 800 (400 + 400)

Try it Yourself »
C divides the operators into the following groups:

- Arithmetic operators
- Assignment operators
- Comparison operators
- Logical operators
- Bitwise operators

## Arithmetic Operators

Arithmetic operators are used to perform common mathematical operations.

Operator | Name | Description | Example | Try it |
---|---|---|---|---|

+ | Addition | Adds together two values | x + y | Try it » |

- | Subtraction | Subtracts one value from another | x - y | Try it » |

* | Multiplication | Multiplies two values | x * y | Try it » |

/ | Division | Divides one value by another | x / y | Try it » |

% | Modulus | Returns the division remainder | x % y | Try it » |

++ | Increment | Increases the value of a variable by 1 | ++x | Try it » |

-- | Decrement | Decreases the value of a variable by 1 | --x | Try it » |

## Assignment Operators

Assignment operators are used to assign values to variables.

In the example below, we use the **assignment** operator (`=`

)
to assign the value **10** to a variable called **x**:

The **addition assignment** operator (`+=`

) adds a value to a variable:

A list of all assignment operators:

Operator | Example | Same As | Try it |
---|---|---|---|

= | x = 5 | x = 5 | Try it » |

+= | x += 3 | x = x + 3 | Try it » |

-= | x -= 3 | x = x - 3 | Try it » |

*= | x *= 3 | x = x * 3 | Try it » |

/= | x /= 3 | x = x / 3 | Try it » |

%= | x %= 3 | x = x % 3 | Try it » |

&= | x &= 3 | x = x & 3 | Try it » |

|= | x |= 3 | x = x | 3 | Try it » |

^= | x ^= 3 | x = x ^ 3 | Try it » |

>>= | x >>= 3 | x = x >> 3 | Try it » |

<<= | x <<= 3 | x = x << 3 | Try it » |

## Comparison Operators

Comparison operators are used to compare two values (or variables). This is important in programming, because it helps us to find answers and make decisions.

The return value of a comparison is either `1`

or `0`

, which means **true** (`1`

) or **false** (`0`

). These values are known as
**Boolean values**, and you will learn more about them in the Booleans and If..Else chapter.

In the following example, we use the **greater than** operator (`>`

) to find out if 5 is greater than 3:

### Example

```
int x = 5;
```

int y = 3;

printf("%d", x > y); // returns 1 (true) because 5 is greater than 3

Try it Yourself »
A list of all comparison operators:

Operator | Name | Example | Try it |
---|---|---|---|

== | Equal to | x == y | Try it » |

!= | Not equal | x != y | Try it » |

> | Greater than | x > y | Try it » |

< | Less than | x < y | Try it » |

>= | Greater than or equal to | x >= y | Try it » |

<= | Less than or equal to | x <= y | Try it » |

## Logical Operators

You can also test for true or false values with logical operators.

Logical operators are used to determine the logic between variables or values:

Operator | Name | Description | Example | Try it |
---|---|---|---|---|

&& | Logical and | Returns true if both statements are true | x < 5 && x < 10 | Try it » |

|| | Logical or | Returns true if one of the statements is true | x < 5 || x < 4 | Try it » |

! | Logical not | Reverse the result, returns false if the result is true | !(x < 5 && x < 10) | Try it » |

## Sizeof Operator

The memory size (in bytes) of a data type or a variable can be found with the `sizeof`

operator:

### Example

```
int myInt;
```

float myFloat;

double myDouble;

char myChar;

printf("%lu\n", sizeof(myInt));

printf("%lu\n", sizeof(myFloat));

printf("%lu\n", sizeof(myDouble));

printf("%lu\n", sizeof(myChar));

Try it Yourself »
Note that we use the `%lu`

format specifer to print the result, instead of `%d`

. It is because the compiler expects the sizeof operator to return a `long unsigned int`

(`%lu`

), instead of `int`

(`%d`

). On some computers it might work with `%d`

, but it is safer to use `%lu`

.