The **`fmodf` function**, a variation of the `fmod` function, calculates the remainder of the division of two numbers. It is available for use in the `math.h` header file.

> `fmodf` uses arguments of ﻿type `float`.





# Prototype
```c
float fmodf(float x, float y)
```
# Parameter and return value

## Parameters
- `x`: floating-point numerator in the division (divisor)
- `y` : floating-point denominator in the division (dividend)

## Return value
- A `float` type remainder of `x`/`y` is returned. The return value is equivalent to `x - n*y`, where n is equal to the quotient of `x`/`y`. 

> The return value's sign is the same as the sign associated with `x`.

# Special cases

 


`fmodf(0, y)`

`fmodf(x, y)`

`fmodf(x, ∞)`

Return value: `0`, if `y` is nonzero

Return value: `NaN`, if either `y` is `0` or `x` is `∞`.

Return value:
`x`, if x is not `∞`.


#include <stdio.h>
#include <math.h>

int main() {
  float a, b, result;
  a = 10.4;
  b = 3.5;
  result = fmodf(a, b);
  printf ("The remainder is: %f", result); // %f is the string formatting placeholder for a floating-point number
  return 0;
}

In the code above, two floating-point numbers are passed as arguments to `fmodf`. The returned floating-point number is stored in the `result` variable, then it's displayed. 

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What is fmodf in C?

The fmodf function calculates the remainder of the division of two float numbers, returning a float.

What is fmodf in C?

Prototype

Parameter and return value

Parameters

Return value

Special cases

Code