CC++主函数的定义（国外英文资料）.docVIP

CC++主函数的定义（国外英文资料） C/C + + master function definition (return function) Some summary of return in C language Return is a c + + pre-defined statement that provides a magnification for the execution of a growing function. This value becomes the return value of the function when the return statement provides a value. When it comes to return, it is necessary to mention the definition of the main function, the following information from the Internet to find, digested, to understand the main function of the return value of understanding there is a lot of help. Many people even have some books on the market that use void main (), which is wrong. There has never been a definition of void main () in C/C + +. Bjarne Stroustrup, The father of c + +, clearly writes The definition void main () in The FAQ on his home page. * /} is not and never has been C + +, nor has it even been c. Let me give you the definition of the main function in C and C + +. 1. C In C89, main () is acceptable. Brian w. Kernighan and Dennis m. Ritchies classic book The C programming Language 2e (The second edition of C programming Language) is used in main (). But in the latest C99 standards, only two definitions are correct: Int main (void) Int main (int argc, char * argv []) (resources: ISO/IEC 9899:1999 (E) Programming languages - C 5.1.2.2.1 Program startup) Of course, we can make a small change. For example, char * argv [] can be written as char * * argv. Argv and argc can be changed to other variable names (such as intval and charval), but must conform to the variable naming rules. If you dont need to get arguments from the command line, use int main (void); Otherwise, please use int main (int argc, char * argv []). The return value type of the main function must be int, so that the return value can be passed to the activator of the program, such as the operating system. If the main function does not have a return statement at the end, the C99 specifies that the compiler should automatically add re