How Do I Access the PI Constant in C ?

Accessing the PI Constant in C

In C , the PI constant is not inherently defined. However, it can be obtained through the inclusion of the header file.

Older systems may require an additional step:

#define _USE_MATH_DEFINES

Once defined, the PI constant can be accessed as M_PI:

#include <math.h>

double pi = M_PI;

It's important to note that on Linux platforms, there are long double value extensions available:

#define M_PIl          3.141592653589793238462643383279502884L /* pi */

The above is the detailed content of How Do I Access the PI Constant in C ?. For more information, please follow other related articles on the PHP Chinese website!