C/C++ main
int main(int argc, char *argv[])
==
int main(int argc, char **argv)
char *argv[] = {"hello","hi"};
char argv[] = {'h','e','l','l','o','h','i'};
char *argv[]//是一个数组,存储char指针
char argv[] //是一个数组,存储char
argc 是计算有几个字符串的
argc = sizeof (argv) / sizeof *argv