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I am trying to understand a program in c and there is a format which I do not understand. Below is what I do not understand

%06i

I do not understand why there is 06, why is it needed. Below is an example of the snippet of the line of code that I am looking at.

printf("\n\t%06i\t...", id, wage, hours, gross);
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It's a formatting code. It means to pad the number with leading zeros so that it is at least 6 digits. If the actual integer is 6 or more digits, it won't get any leading zeros. You can google printf format codes to learn more.

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