Question

Here is a simple one line program using printf :

void main()

{
printf("%d%d",printf("Cis"),printf("good"));
}

Output :

goodCis34

How can this output be explained ??

Answer 1

The reason why good and Cis are printed first is because the parameters need to be evaluated before the top-level printf() can be called.

Then the return values are printed out.

Note that C does not specify the order of evaluation of the parameters. There are no sequence points within the statement. Therefore the order is undefined. And the result can appear in any order. (hence why they appear to be evaluated out-of-order in this case)