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    <p>Since Objective-C is a derivative of C, much of the internals are similar (which is why you can mix C\C++ code in with Objective-C)). As such, when both compile into executables, they work off of similar systems. This is also why Objective-C is compiled by gcc or Clang.</p> <p>With that in mind, what happens when you compile? All of your C code gets converted into Assembly\machine code (since Assembly is just a mnemonic version of machine code). Assembly is on a lower level than Java; the CPU just runs through it and executes each individual instruction sequentially. The <code>main()</code> function in C languages is where the compiler 'knows' where the instructions start at. After you do all of your declarations, the <code>main()</code> function gets jumped to with an instruction called '<code>jmp</code>'.</p> <p>So what happens when you compile in Xcode and launch? First, gcc/Clang converts the code into Assembly\machine code. Second, Xcode loads the binary file into memory. Third, Darwin (OS X or iOS, or any OS for that matter) recognizes that this is an executable area of memory, and starts from the top of the instruction set and runs through each instruction.</p> <p>To answer your question, the <code>main()</code> function is started by the CPU. This is different than Java, which has a platform-independent instruction set that is 'emulated' in the JVM.</p> <p><a href="https://stackoverflow.com/questions/823138">This</a> question has a great answer which explains how the <code>main()</code> function gets translated into Assembly code.</p>
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