evaluation of the increment and decrement operators in C?

This is a discussion on evaluation of the increment and decrement operators in C? within the C Programming forums, part of the General Programming Boards category; Code: printf("%d %d %d \n",++i,i++,--i); Can u please tell me how do we obtain the result as 6 4 6.... ...

  1. #1
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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. #2
    C++ Witch laserlight's Avatar
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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.
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