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Application background RunTime short run time. OC is the running mechanism, that is, some of the mechanisms at run time, the most important is the message mechanism.For the C language, the function of the call at compile time will decide which function to call.For OC function, which is a dynamic call process, in the compilation time and can not determine the real call which function, only in the real running time will be based on the name of the function to find the corresponding function to call.Facts prove:In the compilation phase, OC can call any function, even if the function has not been achieved, as long as the statement will not be reported to the wrong.In the compilation phase, the C language calls the function that is not implemented will be reported to the wrong.
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