Thread: Really weird int problem

  1. #1
    Registered User
    Join Date
    Feb 2006

    Really weird int problem

    Okay, I have this program that im making that's a login program. It uses classes, functions and everything, but what's giving me problems right now is a simple integer in the int main() section.

    Basically, I declare an int (doesnt matter if i declare it as an int or const int...same thing happens) and set it to a value. A few lines later I tell it to cout that value...and it outputs a different value than it should.

    int pass = 01103657;//'secret' password
    cout << pass;
    Here's the troublesome section of code:

    //Main Function
    int main()
    	//Variable declaration
    	int choice, count = 0, i;	
    	int idnum, pwd;
    	int pass = 01103657;//'secret' password
    	char firstname[26];
    	char lastname[26];
    	//Pointer to new data structure in class
    	Students *stdnt = new Students[100];//Students not logged in
    	//Students *stdnt2 = new Students[100];//Student logged in
    	do//Infinite(for now) Menu Loop
    		//Main Menu
    		system("cls");//Clear screen
    		cout << "**** MCC COMPUTER LAB LOGON ****\n";
    		cout << "       !!!PLEASE LOGIN!!!       \n\n";
    		cout << "Please choose:\n";
    		cout << "1. Login\n";
    		cout << "2. Logout\n";
    		cout << "3. New Student\n";
    		cout << "Pleas note that you are a New Student if\n"
    			<< "this is your first time here this semester!!\n\n";
    		cout << pass;
    		cin >> choice;//Enters menu choice
    When I run the program, the cout gives me '296879' instead of '01103657'.

    I can post the whole program if need be.

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    #include <iostream>
    int main() {
    	if (010 == 8) {
    		std::cout << "8 in decimal is 010 in octal\n"
    		          << "01103657 in octal is 296879 in decimal\n";
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    Registered User
    Join Date
    Apr 2003
    If you delete all the irrelevant lines, your program distills to this:
    int pass = 01103657;//'secret' password
    cout<<pass<<endl; //296879
    If you eliminate the leading 0, it displays the correct value. In C++, when you write integers with a leading 0, the compiler interprets that as an octal(base 8) representation of the integer value.

    You can use a C++ string type for the password instead:
    string password = "01103657";
    Last edited by 7stud; 03-08-2006 at 11:02 AM.

  4. #4
    Registered User
    Join Date
    Feb 2006
    Thanks for the replys. Shortly after I posted the question, i realized the answer, lol.

    Now im getting a new error with a different part of the program *sigh*

  5. #5
    Frequently Quite Prolix dwks's Avatar
    Join Date
    Apr 2005
    Post the whole code if you want to.

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    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
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