printf in A Sentence

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    And then in here Printf, hello world,

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    Printf("Enter two numbers to add together:");

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    The Printf function will write to stdout.

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    Will Linux be smart enough to optimize Printf?

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    Printf to actually do its thing.

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    In this line saying Printf,

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    The cast is necessary here, because Printf() is a variadic function, so implicit conversions don't work.

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    Can't simply replace Printf() because the underlying calls inside Printf() can change with a newer version of the stdio library.

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    But I think it will still cost CPU and we better define a macro for Printf so we can rewrite"Printf"(maybe just return).

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    And that's just a fancy way of saying Printf in C is going to be a statement or a function that prints something to the screen.

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    Any time you want to print a string without a linefeed after it, or with escapes in the string, use Printf instead(and learn how it works-- it's more complicated than echo is).

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    If you really need to suppress the output depending on the program execution environment, consider setting a global flag and wrap up Printf to check the flag before printing- it isn't going to slow down the program to an extent where the performance loss is visible, as a single condition check is much faster than calling Printf and doing all the string formatting.

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