Thread: evaluation of the increment and decrement operators in C?

  1. 08-15-2010 #1
    sunilkumar
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    Unhappy evaluation of the increment and decrement operators in C?

    Code:
    printf("%d %d %d \n",++i,i++,--i);
    Can u please tell me how do we obtain the result as
    6 4 6....
    Ofcourse , its been evaluated using a stack...but please tell me how...with an explanation.
    I am not able to understand the evaluation method...
  2. 08-15-2010 #2
    laserlight
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    Order of evaluation of function arguments is implementation defined. Furthermore, the arguments in your example are evaluated in between consecutive sequence points, hence you are modifying i more than once between consecutive sequence points, resulting in undefined behaviour.
    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
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