about printf in keil

i got a small problem.
how to view the contents of varible that is displayed by printf in Uvision keil

#include<reg51.h>
#include<stdio.h>
main()
{ int i; scanf("%d",&i); printf("%d",i);

}

how the input varible 'i' is scanned and how and where it is displayed?

PLz help!!

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