# <math.h>

**[<math.h>](https://en.cppreference.com/w/c/header/math)** provides standard math functions: trigonometric, exponential, logarithmic, rounding, and IEEE 754 utilities (`isnan`, `isinf`). Append `f` for float or `l` for long double versions.

Compile with `-lm` to link the math library.

## Example

This example demonstrates basic math functions and special-value checking.

```c
// compile: gcc -o mathexample mathexample.c -lm
// run: ./mathexample
// description: math functions and special value detection

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

int main() {
    printf("sqrt(2) = %.6f\n", sqrt(2.0));
    printf("sin(pi/4) = %.6f\n", sin(M_PI / 4));
    printf("exp(1) = %.6f\n", exp(1.0));
    printf("log(10) = %.6f\n", log(10.0));
    
    double nan_val = 0.0 / 0.0;
    double inf_val = 1.0 / 0.0;
    printf("isnan(nan): %d, isinf(inf): %d\n", isnan(nan_val), isinf(inf_val));
    
    return 0;
}
```