How can f be used for both float and double arguments in printf? Aren't they different types?
Q
How can f be used for both float and double arguments in printf? Aren't they different types?
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A
In the variable-length part of a variable-length argument list, the ``default argument promotions'' apply: types char and short int are promoted to int, and float is promoted to double. (These are the same promotions that apply to function calls without a prototype in scope, also known as ``old style'' function calls. Therefore, printf's %f format always sees a double. (Similarly, %c always sees an int, as does %hd.)
2015-06-17, 1010👍, 0💬
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