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cincrementdecrement

Explain the output?

#include<stdio.h>

int main()
{
int a = 10;

printf("%d %d %d",++a,a++,a--);

return 0;
}

I edited the code a bit..now the outputs are : 11 9 10 It's more complex now..

Solution

  • It's up to the compiler in which order he evaluates the parameters of a function call.

    If the compiler goes from left to right (that would explain your output):

    • a is 10
    • prä-increment which means a is incremented (the value 11 is passed as parameter)
    • post-decrement which means a is decremented later (the the value 11 is passed as parameter)
    • post-increment which means a is incremented later (the value 10 is passed as parameter)

    But if I compile this e.g. with another compiler I could get different output.