Displaying integer

Code:

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int i = 0;
cout<< i;

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i want to display i as in 000
if my int i = 1, i want it to display 001.

how do i code it so that it works like that?

http://www.cplusplus.com/reference/i...pulators/setw/
http://www.cplusplus.com/reference/i...ators/setfill/