why sizeof is not changing the value

[maheshgupta024]

main()
{
int temp = 3;
int x = sizeof(temp++);
printf("%d\n", temp);
}

In the above piece of code. I find that variable temp is not changed after sizeof operation. Can anyone tell me what is the reason for this.

[Meetee]

sizeof returns the size of the type of the variable which is 4 in this case (integer type). sizeof is performed at compile-time with the type of the variable. It doesn't do any evaluation on value of variable.

Please use code quotes around your piece of code.

[donbock]

Annex J.1 of the C99 specification provides a list of situations that produce unspecified behavior. The following item from that list is germane to your question:

Whether or not a size expression is evaluated when it is part of the operand of a sizeof operator and changing the value of the size expression would not affect the result of the operator (6.7.5.2).