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代码: 

#include <stdio.h>
#include <math.h>
int main() {

    float s = 1,pi = 0,i = 1.0,n=1.0;//s 是项数,pi是π,i是当前项的值,n是分母
    while(fabs(i) >= 1e-6){//最后一项的绝对值不小于1e-6

        pi += i;
        n = n+2;
        s = -s;
        i = s/n;

    }
    pi = 4 * pi;

    printf("PI Value:%.6f\n",pi);
    return 0;
}

运行结果: 

PI Value:3.141594