关于printf一些少见但很有用的技巧
printf is the C language function to do formatted printing. The same function is also available in PERL. This paper explains how printf works, andhow to design the proper formatting specification for any occasion. Background In the early days, computer programmers would write their own subroutines to read in and print out numbers. It is not terribly difficult, actually. Just allocate a character array to hold the result, divide the number by ten, keep the remainder, add x30 to it, and store it.
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