"f"代表什么?在C标准库函数名称中代表? [英] What does "f" stand for in C standard library function names?

问题描述

f在C标准库函数的名称中代表什么?我注意到许多函数的名称中都带有f，这对我来说真的没有意义.

What does f stand for in the name of C standard library functions? I have noticed that a lot of functions have an f in their name, and this does not really make sense to me.

例如:fgets，fopen，printf，scanf，sqrtf等.

推荐答案

您的问题总体而言过于笼统，但我可以解释一些示例.

Your question in general is too general but I can explain a few examples.

• fgets ， fclose ，… — "f"代表文件".与POSIX函数一样，这些函数接受或返回FILE *指针而不是文件号.
• printf ，
• fprintf ， sinf ，float(与double替代项区分开).请注意，这与在1.5f中加f的浮点字面量后缀非常吻合.
• 最后，作为重复数据删除器要点，其中有一些名称，例如 free ， setbuf (设置缓冲区")，其中的"f"只是自然语言字符.

• fgets, fopen, fclose, … — The "f" stands for "file". These functions accept or return a FILE * pointer as opposed to a file number as the POSIX functions do.
• printf, scanf, … — The "f" stands for "formatted". These functions accept a format string.
• fprintf, fscanf — This is a combination of the above two.
• sinf, cosf, … — The "f" stands for float (to distinguish from the double alternatives). Note that this fits quite nicely with suffixing floating point literals with an f as in 1.5f.
• Finally, as Deduplicator points out, there are some names such as free, floor or setbuf ("set buffer") where the "f" simply appears as a natural language character.

在名称中使用带单个字母的前缀或后缀来表示参数类型的传统是C中的必要条件，由于重载，它已在C ++中过时.实际上，在C ++中，重载是由编译器通过称为名称修改.

The tradition of pre- or suffixing names with single letters that indicate the type of the arguments is a necessity in C that has become obsolete in C++ thanks to overloading. Actually, overloading in C++ works by the compiler automatically adding those suffixes again under the hood to the generated symbols by a process called name mangling.

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