sleep() delays output until end

> **Possible Duplicate:** > [Why does printf not flush after the call unless a newline is in the format string? (in C)]( I'm using the sleep() function in C, and am running into a problem: I wasn't sure that this was the problem so I boiled the entire code down to this: int main() { printf("1"); sleep(3); printf("2"); return 0; } What I thought this should produce is 1 .. wait for 3 seconds .. 2. Instead the program waits for 3 seconds and then prints 12. Is there any way to use the sleep function so that I get the first output? Thanks
As I mention below, I was unaware that this was the cause of the problem.

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