#include#include int main(void){ double e,pi; double funpi(double e); printf("Enter e:"); scanf("%lf",&e); pi=funpi(e); printf("pi=%f\n",pi); return 0;}double funpi(double e){ int denominator,flag; double item,sum; flag=1; denominator=1; item=1.0; sum=0; while(fabs(item)>=e){ item=flag*1.0/denominator; sum=sum+item; flag=-flag; denominator=denominator+2; } return sum*4;}