概率法计算PI

#include <iostream>

using namespace std;

//概率计算PI

int main()

{

    int inside=0;

    double val;

    int i;

    for ( i=0; i<100000000; i++)

    {

        double x = (double)(rand())/RAND_MAX;

        double y = (double)(rand())/RAND_MAX;

        if ( (x*x + y*y) <= 1.0 )

        {

            inside++;

        }

    }

    val = (double)inside / i;

    printf("PI = %.4g\n", val*4);

    return 0;

}

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