The **`crealf` function** is part of the `<complex.h>` header file in C. It is used to return the real part of a complex number of type `float`. The function takes in a single parameter: a `float complex` number. 

> A complex number has a **real** and an **imaginary** part.

The illustration below shows how `crealf` works:

# Declaration

The `crealf` function is defined as follows:

```C
float crealf(float complex z);
```
It takes in a single parameter of type `float complex`.

# Example

The following code snippet shows how we can use the `crealf` function. The code below outputs the real part of the complex number:

#include <stdio.h> // Including header file for printf function
#include <complex.h> // Including header file for crealf function

int main(){

  float complex z = 2.0 + 7.0*I; // assign value to variable
  printf("The real part is %f", crealf(z));
  return 0;
}

> `crealf`, `creal` and `creall` are similar functions.

* `crealf` takes a `float` complex number and returns its`float` real
* `creal` takes a `double` complex number and returns its `double` real
* `creall` takes a `long double` complex number and returns its `long double` real

What is crealf in C?

<complex.h> header in C. Returns the real part of a float complex number. Similar to creal and creall."