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C语言中的%i

%i的作用与%d一致，详情可见man 3 printf

d, i   
The int argument is converted to signed decimal notation.

The precision, 
if any, gives the minimum number of digits that  must  appear;  
if  theconverted value requires fewer digits, it is padded on the left with zeros.  
The default precision is 1.  When 0 is printed with an explicit pre‐cision 0, the output is empty.