Many functions return useful values whether or not the function has side effects. In most cases, this value is used to signify whether the function successfully completed its task or if some error occurred (see ERR02-C. Avoid in-band error indicators). Other times, the value is the result of some computation and is a necessary outputan integral part of the function's API.
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Section 6.8.3 of C99 \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] states that |
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