How to express π in C language

There is no built-in π constant or function in C language. Methods that can approximate π include: using the macro #define PI 3.14159265 including the library and using the M_PI constant using a floating point number type with a specific precision, such as double using the atan(1) function to implement the π calculation algorithm

represents π in C language

In C language, there is no built-in constant or function that directly represents π. However, there are several ways to approximate π:

1. Using macros

The following macros can be used to define an approximation of π:

#define PI 3.14159265

2. Use the math library

<math.h></math.h> The library provides the M_PI constant, which is a high-precision approximation of π:

#include <math.h>

double pi = M_PI;

3. Use specific precision

C language supports floating-point number types with different precisions, such as float and double. You can use specific floating point types depending on the precision you require. For example, the following code uses the double type to store the value of π:

double pi = 3.14159265358979323846;

4. Using the function

You can use the atan(1) function To calculate the approximate value of π:

double pi = 4 * atan(1);

5. Use the algorithm

There are also various algorithms to calculate the approximate value of π, such as circus secant and Munchola series . You can use these algorithms to implement your own pi functions.

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