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/*

 *File:calculate PI.c

 *------------------------

 *This program is calculate the PI

 */

 

#include<stdio.h>

#include"simpio.h"

#include"genlib.h"

#include<math.h>

#define  r 2

 

/ * Function program */

double calculate_PI (void)

/* Main prorgram */

int main()

{

    printf(" This program is  answer the PI");

    printf("The PI is %g\n",calculate_PI ());

 

     return 0;

}

/* 

 *Function: To calculate PI;

 * Usage:Tocalculate ()

 *---------------------------------

 *This  program calculate the PI

 */

double calculate_PI (void)

{
  int n = 100;

  double w;

  w = r / n;                                      // 纠错: int 型除以int 型 ,如果是浮点数的话会强行转换,此处是 2 / 100; 所以会是0;

  double s,x,h;                               //  把 w  = r /n  改成 w = (double)r / n;强制转化成double型;以后写代码时需要注意小细节

  double S =0;

  for (int i = 1;i <= n;i++) {

     x = (w / 2) + (i - 1) * w;

    h = sqrt (r*r - x*x);

    s = h *w;

    S = S + s;

  }

  return (S);

}

 

/*

 * 欢迎各位朋友对我的代码进行改造和优化,本人不胜感激!

 * 若有相关专业的朋友可以私信我,一起修炼,哈哈哈哈

 */

 

posted @ 2019-11-14 23:23  jianzhui  阅读(101)  评论(0编辑  收藏  举报