Thread: What am I doing wrong with struct tm?

  1. #1
    Registered User
    Join Date
    Oct 2008

    Question What am I doing wrong with struct tm?

    I have look around and around, and now matter what I seem to do I just can't seem to get this to work. I don't understand what I'm doing wrong. I've tried it with 'struct' in front of 'tm *today' as well

    When I debug it, I get "Error 2 error C2228: left of '.tm_mon' must have class/struct/union". Which I don't get since I thought I had declared it.

    #include <stdio.h>
    #include <iostream>
    #include <ctime>
    using namespace std;
    int main ()
    	char test;
    	time_t now;
    	tm *today;
    	cout << today.tm_mon << endl;
    	cout << "Did it work?";
    	cin >> test;
      return 0;
    What am I doing wrong?

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    It's a pointer to a struct.

    So it's
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    Since today is a pointer, it should be today->tm_mon.
    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

  4. #4
    Registered User
    Join Date
    Oct 2008

    Lightbulb Thanks

    Thanks, that was a silly thing to miss when I read that several times.

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