# C Operators

Operators

## Operators

The Operators are used to perform operations on variables and values.

In the example of the below, we will use the `+` operator to add together two values:

### Example:

#include <stdio.h>

int main() {

int myNum = 100 + 50;

printf("%d", myNum);

return 0;

}

OUTPUT: 150

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

### Example:

#include <stdio.h>

int main() {

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

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

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

printf("%d\n", sum1);

printf("%d\n", sum2);

printf("%d\n", sum3);

return 0;

}

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 the common mathematical operations.

 Operator Name Description Example + Addition Adds together two values x + y - Subtraction Subtracts one value from another x - y * Multiplication Multiplies two values x * y / Division Divides one value by another x / y % Modulus Returns the division remainder x % y ++ Increment Increases the value of a variable by 1 ++x -- Decrement Decreases the value of a variable by 1 --x

## Assignment Operators

Assignment operators are used to the assign values to variables.

In the example of below, we will use the assignment operator (`=`) to assign the value 10 to a variable called x:

### Example:

#include <stdio.h>

int main() {

int x = 10;

printf("%d", x);

return 0;

}

The addition assignment operator (`+=`) adds a value to a variable:

### Example:

#include <stdio.h>

int main() {

int x = 10;

x += 5;

printf("%d", x);

return 0;

}

A list of all the assignment operators:

 Operator Example Same As = x = 5 x = 5 += x += 3 x = x + 3 -= x -= 3 x = x - 3 *= x *= 3 x = x * 3 /= x /= 3 x = x / 3 %= x %= 3 x = x % 3 &= x &= 3 x = x & 3 |= x |= 3 x = x | 3 ^= x ^= 3 x = x ^ 3 >>= x >>= 3 x = x >> 3 <<= x <<= 3 x = x << 3

## Comparison Operators.

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

The return value of a comparison is the either `1` or `0`, which means true (`1`) or the false (`0`). These values are known as the Boolean values, and you will be learn more about them in the Booleans and If..Else chapter.

In the following example, we will use the greater than operator (`>`) to find out if 5 is greater than 3:

### Example:

#include <stdio.h>

int main() {

int x = 5;

int y = 3;

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

return 0;

}

A list of all the comparison operators:

 Operator Name Example == Equal to x == y != Not equal x != y > Greater than x > y < Less than x < y >= Greater than or equal to x >= y <= Less than or equal to x <= y

## Logical Operators

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

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

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

### Example:

#include <stdio.h>

int main() {

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));

return 0;

}