What's the difference between printf("%i") and printf("%d") [duplicate]

Question

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Difference between format specifiers %i and %d in printf

I just checked the reference, it says both of them indicate signed integer. I thought there must be some difference

Answer 1

There is no difference.

From the C99 standard document, section 7.19.6.1:

d, i

The int argument is converted to signed decimal in the style [−]dddd. The precision specifies the minimum number of digits to appear; if the value being converted can be represented in fewer digits, it is expanded with leading zeros. The default precision is 1. The result of converting a zero value with a precision of zero is no characters