计算圆周率PI

  • 服务器地址 172.16.192.24

  • 用户名 2019301110060

  • 计算圆周率

#include <time.h>
    #include <stdio.h>
    double step;
    int main(){
        static long num_steps;
        printf("请输入一个1000以上的数字求取PI值\n>>");
        scanf("%ld",&num_steps);
        clock_t start_t, end_t;
        double total_t;
        int i;
        double x,pi,sum =0.0;
        start_t = clock();
        step=1.0/(double)num_steps; //将1平分成100000步
        for(i=1;i<=num_steps;i++){
            x=(i-0.5)*step;//获得0-1的连续值
            sum+=4.0/(1.0+x*x);
        }
        pi =step * sum; //
        end_t = clock();
        total_t=(double)(end_t - start_t)/CLOCKS_PER_SEC;
        printf("运行时间为%fs\t%.10f\r\n",total_t,pi);
        return 0;

    }

  • 加上时间和精度的控制

  • 输出结果

Previous实验室考试Next04.forthClass

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