#include<stdio.h>
#include<math.h>
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;
}
转载于:https://www.cnblogs.com/liruijia199531/p/3357416.html
