Modulus on negative numbers in C language

C language modulus operator with negative values: Here, we are going to learn about the behaviour of modulus operator with the negative numbers.
Submitted by IncludeHelp, on April 14, 2019

The modulus operator (%) operator in C

The modulus operator is an arithmetic operator in C language; it is a binary operator and works with two operands. It is used to find the remainder.

Syntax

```operand1 % operand2;
```

It returns the remainder which comes after dividing operand1 by operand2.

Example

```Input:
int a = -10;
int b = 3;

// finding remainder
result = a%b;
printf("result = %d\n", result);

Output:
result = -1
```

C code to demonstrate example of modulus operator with positive operands

```// C program to demonstrate example of
// Modules operator (%)

#include <stdio.h>

int main()
{
int a = 10;
int b = 3;

int result;

result = a%b;

printf("result = %d\n", result);

return 0;
}
```

Output

```    result = 1
```

Modulus operator with negative numbers

If we have negative numbers, the result will be based on the left operand's sign, if the left operand is positive – the result will be positive, and if the left operand is negative – the result will be negative.

Thus, in the result (remainder), the sign of left operand is appended.

Understand with the below table:

```Left operand    Right operand 	Result
Positive	    Positive 		Positive
Positive	    Negative		Positive
Negative 	    Positive		Negative
Negative	    Negative		Negative
```

Example

```Input:
int a = -10;
int b = 3;

// finding remainder
result = a%b;
printf("result = %d\n", result);

Output:
result = -1
```

C code to demonstrate example of modulus operator with negative operands

```// C program to demonstrate example of
// Modules operator (%)

#include <stdio.h>

int main()
{
int a = -10;
int b = 3;

int result;

result = a%b;
printf("result = %d\n", result);

a = 10;
b = -3;
result = a%b;
printf("result = %d\n", result);

a = -10;
b = -3;
result = a%b;
printf("result = %d\n", result);

return 0;
}
```

Output

```result = -1
result = 1
result = -1
```