02-20-2019
Your question is not clear at all. In first code Input arguments are always defined in the variable argc. In the second example, the parameters for the 64-bit system are enumerated. Since the transition from 32 to 64-bit broke the compatibility of the transfer in a function an indefinite number of parameters. Some parameters were passed to the function through the registers and not through the stack. Therefore, macros were invented va_list, va_start, va_end. These are all different things. Choose what you need.
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