编程基本功——复杂级数的前n项和

#include "stdio.h"

int main()
{
    float m = 1.0;
    float n = 1.0;
    float s = 0.0;
    int i, j;

    for (i=1; i<=5; ++i)
    {
        for (j=0; j<i; ++j)
        {
            m = m * 0.5;
        }
        for (j=1; j<=i; ++j)
        {
            n = n * j;
        }
        s = s + m*n;
        m = 1.0;
        n = 1.0;
    }
    printf("Sn = %f\n", s);

    return 0;
}