Question

How to declare PI constant in C

Answer 1

#include <stdio.h>

# define PI 3.141592653589793238462643383279

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

    double pi = PI;
    printf("%.12f\n", pi);

    return 0;
}





/*
run:

3.141593
3.141592653590

*/

 

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