Thread: beginner question

  1. #1
    Registered User
    Join Date
    Jul 2007

    beginner question

    #include <iostream>
    #include <iomanip>
    using namespace std;
    int main()
    	char state[3];
    	cout << "Enter NC, SC, GA, FL, or AL. ";
    	cin >> state;
    	if (state == "nc" || state == "NC")
    		cout << "North Carolina.";
    	else cout << "That is an invalid choice.\n";
    When I input nc or NC, it does not output north carolina, but displays the invalid message. What did I do wrong? thanks

  2. #2
    The larch
    Join Date
    May 2006
    Char arrays cannot be compared with == because it will compare the addresses of the arrays (pointers) and not the array contents. Either use the strcmp function or std::string (which allows comparison with comparison operators).
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  3. #3
    Registered User
    Join Date
    Jul 2007
    if ((strcmp(state, "nc") == 0) || (strcmp(state, "NC") == 0))
    strcmp() takes the two strings and compares them. The output is zero when they are equal.

  4. #4
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    so better to use std::string to avoid possible buffer overrun problems and simplify the string comparisons
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

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