factor.cpp

这是vc图书里面的源代码 相信对于开发着有所帮助

#include    <stdio.h>
#include    <iostream.h>
#include    <stdlib.h>

unsigned long factor (unsigned long Num);

void main (int argc, char *argv[])
{
    if (argc < 2)
        return;
    unsigned long factorial = factor (atol (argv[1]));
    cout << " = " << factorial << endl;
}

unsigned long factor (unsigned long Num)
{
    cout << Num;
    if (Num > 1)
    {
        cout << " x ";
        return (Num * factor (Num - 1));
    }
    return (1);
}