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Update index.md (#30620)

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Tristan Sweet 2018-12-18 16:24:13 -06:00 committed by Christopher McCormack
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@ -49,7 +49,7 @@ int main(void)
This code declares the main function. The main function is special - it will always get called exactly one time and is always the 'main' part of your program. If this isn't in your program, your program can't run and won't compile. This code declares the main function. The main function is special - it will always get called exactly one time and is always the 'main' part of your program. If this isn't in your program, your program can't run and won't compile.
Starting the function declaration with `int` means that this function will return an `int` or integer value when it compiles the code - it's this function's output. `int` is the 'integer' data type, and integers are whole numbers like -3, 0, or 18. So we know that this code will run, and when it's done, it will give us back an integer. By convention, the integer returned is `0` to signal to the operating system the program exited successfully. Starting the function declaration with `int` means that this function will return an `int` or integer value when it compiles the code - it's this function's output. `int` is the 'integer' data type, and integers are whole numbers like -3, 0, or 18. So we know that this code will run and, when it's done, it will give us back an integer. By convention, the integer returned is `0` to signal to the operating system the program exited successfully.
Next is `main`. The `main` function is the parent where all the other elements and functions are it's children. `main` is followed by a list of arguments or inputs to the function, in our case there are none, so we denote it with `(void)`. This tells the compiler that this function doesn't take any arguments, meaning that it has no input. Next is `main`. The `main` function is the parent where all the other elements and functions are it's children. `main` is followed by a list of arguments or inputs to the function, in our case there are none, so we denote it with `(void)`. This tells the compiler that this function doesn't take any arguments, meaning that it has no input.