simulating printf

hello,
i'm using uVision3.
question1:
i want to simulate the printf so i can
see what is printing.
I've tried SLOG but nothing is write to the created file. WHY ?
question2:
Why when i debug my code (with F11), after executing
the printf code line the yellow arrow that indicates the executed line is disappear and the program
shift to run mode (time is elapseing) ?

thanks in advance.

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