PPT《第三章 控制语句》

2 ? 计算新的当前项item = num / den pi = pi *

4 输出pi * 3.4.1 while语句举例(编程实现) ......double pi = 0.0;

int num = 1;

int den = 1;

double item = 1.0;

while(fabs(item) > 1e-6) { pi = pi + item;

num = -num;

den = den + 2;

item = (double)num / den;

}pi = pi * 4;

cout