c++ - 无限循环问题

我有个问题。此代码未提供应有的结果。它在控制台上的编号应该很大，由于某种原因，它在执行此操作时会忽略if语句。同样，在此程序中，InputNum应保留为long数据类型。

#include <iostream>
#include <fstream>

using namespace std;

/*
Function Name: CalculateBinary
CalculateBinary takes a number from the main function and finds its binary form.
*/

void CalculateBinary(long InputNum)
{
    //Takes InputNum and divides it down to "1" or "0" so that it can be put in binary form.
    if ( InputNum != 1 && InputNum != 0)
        CalculateBinary(InputNum/2);

    // If the number has no remainder it outputs a "0". Otherwise it outputs a "1".
    if (InputNum % 2 == 0)
        cout << "0";
    else
        cout << "1";
}


void main()
{
    // Where the current number will be stored
    long InputNum = 3000000000;

    //Opens the text file and inputs first number into InputNum.
//  ifstream fin("binin.txt");
//  fin >> InputNum;

    // While Input number is not 0 the loop will continue to evaluate, getting a new number each time.
    while (InputNum >= 0)
    {
        if(InputNum > 1000000000)
            cout << "Number too large for this program ....";
        else
            CalculateBinary(InputNum);

        cout << endl;
        //fin >> InputNum;
    }
}

最佳答案

CalculateBinary(InputNum)不会修改InputNum的值，因此其值将始终相同(300000000)，而while循环永远不会结束。