C program for zeta function

/*Zeta function*/

#include<stdio.h>

#include<math.h>

void

main()

{

                int i;

                float s=0.0,pi,d;

                for(i=1;i<=4;i++)

                {

                                s=s+pow(i,-4);

                }

                d=s*90;

                pi=pow(d,0.25);

                printf("\n the value of pi is=%f\n",pi);

}

RESULT:

 the value of pi is=3.138998

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