The **`fmaf` function** is defined in the `<math.h>` header file in C. It takes in three parameters of type `float`: `x`, `y`, and `z`. It then computes $(x*y) + z$ and returns the resultant `float` value.

The illustration below shows how the `fmaf` function works:

# Declaration

The `fmaf` function is defined as follows:

```C
float fmaf( float x, float y, float z );
```

# Parameters

The `fmaf` function takes in three parameters of type `float`. The first two parameters, `x` and `y`, are multiplied together. Their product is then added to the third parameter, `z`.

# Return value

The `fmaf` function returns the result of the computation of type `float`.

# Error handling

The `fmaf` function returns special values for certain arguments:

| x  | y  | z  | Returned Value |
| - | - | - | - |
| 0  | `INFINITY`  | `Not NaN`  | `NaN` |
|`INFINITY` |0 |`Not NaN` | `NAN`|
|`INFINITY` |0 |`NaN` | `NaN`|
|0 |`INFINITY` |`NaN` | `NaN`|
|`NaN` |valid `float` |valid `float` | `NaN`|
|valid `float` |`NaN` |valid `float` | `NaN`|
|valid `float` |valid `float` |`NaN` | `NaN`|

# Example

The following code snippet shows how we can use the `fmaf` function:


#include <stdio.h> // include header for printf
#include <math.h> // include header for fmaf
 
int main(){

  // setting values fpr x, y, and z
  float x = 2.0;
  float y = 4.0;
  float z = 5.0;
  float result;

  result = fmaf(x, y, z);
  printf("The result is: %f", result);  
  return 0;
}

The following code snippet shows how error handling in the `fmaf` function works:

#include <stdio.h> // include header for printf
#include <math.h> // include header for fmaf
 
int main(){

  float x = INFINITY; // setting x to INFINITY
  float y = 0.0;
  float z = 5.0;
  float result;

  result = fmaf(x, y, z);
  printf("The result is: %f", result);  
  return 0;
}


What is fmaf in C?

The fmaf function is defined in the  header file in C. It takes in three parameters of type float: x, y, and z. It then computes (x∗y)+z(x*y) + z(x∗y)+z and returns the resultant float value. The illustration below shows how the fmaf function works: 

x	y	z	Returned Value
0	`INFINITY`	`Not NaN`	`NaN`
`INFINITY`	0	`Not NaN`	`NAN`
`INFINITY`	0	`NaN`	`NaN`
0	`INFINITY`	`NaN`	`NaN`
`NaN`	valid `float`	valid `float`	`NaN`
valid `float`	`NaN`	valid `float`	`NaN`
valid `float`	valid `float`	`NaN`	`NaN`