printf(), C string & Comma operator

[IIUC GOLD]

The following code
[c]char* strTest="Hello";
printf(("%s World!!", strTest));
[/c]
gives output

Code: Select all

Hello

Can anyone explain the output.

[sohel]

printf(("%s World!!", strTest));

This function looks a little different from the traditional. You have used two pairs of parantheses to write the function.
Perhaps thats the reason.

[UFP2161]

The comma operator evaluates things from left to right, and returns the result of the last operation, i.e. tries to evaluate "%s World!" and then tries to evaluate strTest .. then it returns strTest, which is a string, which printf can directly print, and thus you get "Hello"