一、N-S流程图；

二、运行结果；

三、源代码；

# define _CRT_SECURE_NO_WARNINGS
# include <stdio.h>
# include <math.h>int main()
{//初始化变量值；int symbol = 1;double denominator = 1.0, sum = 0, term = 1.0;//循环判断；while (fabs(term) >= 1e-6){//运算；sum = sum + term;//改变变量的值；symbol = -symbol;denominator = denominator + 2;term = symbol / denominator;}//运算；sum = sum * 4;//输出结果；printf("π的近似值为：%10.8f\n", sum);return 0;
}