说明：  我们在C语言编程中会遇到一些参数个数可变的函数,例如printf()这个函数,它的定义是这样的: 　　int printf( const char* format, ...) 它除了有一个参数format固定以外,后面跟的参数的个数和类型是可变的,例如我们可以有以下不同的调用方法:
(We in the C programming language will encounter some function of the variable number of arguments, such as printf () function, which is defined like this: int printf (const char* format, ...) It is in addition to a fixed parameter format outside, followed by the number and type of parameters is variable, for example, we can have the following different calling method: )