Question

How to get the constant PI value from math.h in C

Answer 1

#include <stdio.h>
#include <math.h>
 
int main(void)
{
	printf("%.2f", M_PI);
     
    return 0;
}

 
/* 
run:

3.14

*/

 

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Answer 2

#include <stdio.h> 

#define _USE_MATH_DEFINES 
#include <math.h>  

int main()
{
    printf("%f\n", M_PI);

    return 0;
}

/*
run:

3.141593

*/

 

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