程序代码：

#include <stdio.h>

int main()
{
    unsigned long product;
    int i,j,n;
    double k=0;
    printf("输入一个数:");
    scanf("%d",&n);
    
    for(i=1;i<=n;i++)
    {
        for(j=1,product=1;j<i;j++)
            product*=j;
        k+=1.0/product;
    }
    printf("%lf",k);
    return 0;
}

程序代码：

#include <stdio.h>

double foo( unsigned n )
{
    double result = 1;

    double tmp = 1;
    for( unsigned i=0; i!=n; ++i )
    {
        tmp /= i+1;
        result += tmp;
    }

    return result;
}

//#include <assert.h>

int main( void )
{
    //assert( foo(0) == 1 );
    //assert( foo(1) == 1 + 1/1 );
    //assert( foo(2) == 1 + 1/1 + 1/2. );
    //assert( foo(3) == 1 + 1/1 + 1/2. + 1/6. );

    unsigned n;
    scanf( "%u", &n );
    printf( "%f\n", foo(n) );
}

[此贴子已经被作者于2022-10-31 14:49编辑过]