Help me finish this program

[waspzero]

So I have a homework
I have to write a program which will test if an integer is a three digit number or not (I obviously have to use IF) and if it is, it should write it in reversed form. (from 123 to 321)
and also
printing should happen in file "sample.txt" ( I don't know what this means O_o)


I know that second part (reversed number) is like this

#include <iostream>
#include <conio.h>

using namespace std;

int main()
{
	long int num1, num2, rnum=0;
	cout << "enter an integer: " << endl;
	cin >> num1;
	num2=num1;
	do
	{
		rnum=rnum*10;
		int digit = num1%10;
		rnum+=digit;
		num1/=10;
	}
	while(num1);
		cout << " integer you typed is " << num2 << endl;
	    cout << " reversed integer is " << rnum << endl;
		system("pause");
		return 0;
}

but I can't write the whole program without errors :(

help

[Yanson]

can you use string? this would be verry simple.

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string num;

    cout << "Please enter an integer: ";
    getline(cin, num);

    if(num.size() == 3)
    {
        cout << "The number is 3 digits long " << endl;
        cout << "The number in reverse is ";

        string::reverse_iterator it;
        for (it = num.rbegin(); it < num.rend(); it++)
            cout << *it;

        cout << endl;
    }
    else
        cout << "The number does not contain 3 digits";


    cin.ignore();
    return 0;
}

[waspzero]

Yanson
Thank you very much!