通常，在每个C或C ++程序开始执行code（包括通常由编译器/链接默认）做了一些初始化和然后调用一个名为主要功能。如果该函数不present，它将链接的程序（其中所有的名字必须解决）时导致一个悬而未决的名称。如果是present，它会被程序初始化code被调用。

Generally, the code that is executed at the beginning of every C or C++ program (included usually by default by compilers/linkers) does some initialization and then calls a function called main. If this function is not present, it will lead to an unresolved name when linking a program (in which all the names have to be resolved). If it is present, it will be called by the program initialization code.

初​​始化code做一些家务（例如，转换的主要功能为程序的退出code中的返回值，等等。）

The initialization code does some housekeeping (for example, converts the return value of the main function to the exit code of the program, etc.)