Boolean prob

This is a discussion on Boolean prob within the C++ Programming forums, part of the General Programming Boards category; Hi, I'm quite new to cpp programming, and I made this small script using Dev-C++. Code: #include <iostream> using namespace ...

  1. #1
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    Boolean prob

    Hi, I'm quite new to cpp programming, and I made this small script using Dev-C++.

    Code:
    #include <iostream>
    
    using namespace std;
    
    int main()
    
    {
    int x;
        
        cout<<"Enter 1 or 0: "; 
        cin>>x;
        cin.ignore();
        if ( x = ( 1 || 0 ) ) {
             cout<<"Hello World";
             } 
        else if ( x = ( 1 && 0 ) ) {
             cout<<"World Hello";
             }
        cin.get();
    }
    Problem here is, if I enter 0, it should be printing World Hello instead of Hello World, which doesn't happens. Ofcourse I could easily solve this by adding a NOT operator, but I want to know about the AND and OR operators in specific. Could someone help me out?

  2. #2
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    You're first if statement is checking to see if the value of x is EITHER a 1 or 0. If it is EITHER of those values, then it prints Hello World.

    In a literal sense, your second if statement is saying if the value of x is BOTH 1 and 0, then it prints World Hello.

    You would want something like this:
    Code:
    if(x = 1)
    	 cout << "Hello World";
    else
    	 cout << "World Hello";

  3. #3
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    Quote Originally Posted by xmltorrent
    You're first if statement is checking to see if the value of x is EITHER a 1 or 0. If it is EITHER of those values, then it prints Hello World.

    In a literal sense, your second if statement is saying if the value of x is BOTH 1 and 0, then it prints World Hello.

    You would want something like this:
    Code:
    if(x = 1)
    	 cout << "Hello World";
    else
    	 cout << "World Hello";
    Aha! Ofcourse I understand what was in you code, but I was just playing around with the booleans. Thank you.

  4. #4
    Registered User Tonto's Avatar
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    You're first if statement is checking to see if the value of x is EITHER a 1 or 0. If it is EITHER of those values, then it prints Hello World.

    In a literal sense, your second if statement is saying if the value of x is BOTH 1 and 0, then it prints World Hello.
    Not exactly.

    Code:
    if ( x = ( 1 || 0 ) )
    1 || 0 always evaluates to a true, which you then assign to x, automatically making it execute.

    Code:
    else if ( x = ( 1 && 0 ) )
    1 && 0 evaluates to a false, which you then again assign to x, and making it not execute.

  5. #5
    Guest Sebastiani's Avatar
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    couple of problems:

    >> if ( x = ( 1 || 0 ) )

    first off, your assigning a value to x, use == for comparison. the above expression would then evaluate to:

    if(x == 1)

    since (0 || 1) == 1

    so the correct expression would be:

    if (x == 1 || x == 0)



    ITSA
    Socket Library!

  6. #6
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    That solved the problem, assigned them to x, instead of checking them, stupid me. Tnx.

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