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_Check_return_

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Compilation time: 1,75 sec, absolute running time: 1,16 sec, absolute service time: 2,93 sec 
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Warning(s):
source_file.cpp(17) : warning C6031: Return value ignored: 'fopen'.
source_file.cpp(22) : warning C6031: Return value ignored: 'f__Check_return_'.
source_file.cpp(28) : warning C6031: Return value ignored: 'f__Must_inspect_result_'.
source_file.cpp(29) : warning C28193: 'b2' holds a value that must be examined.: Lines: 12, 13, 17, 18, 22, 23, 28, 29, 30, 31
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64