call the main function in the system console, after the operation how garbled words??????

CodePudding user response:

Need to analyze the types of argv, type is char * []; , the pointer array, from the host's case, the original poster of the argv array length is 5.
You need to know about the argv++; How many bytes are offset, the original poster to achieve argv [0] - & gt; Argv [1] - & gt; Argv [2],,, this migration, the amount of deviation is sizeof (argv [0]).
But argv++; That is offset 5 * sizeof (argv [0]). Have crossed, so shows that the code is should be crossing the line is undefined behavior;

 
Char * p=argv [0]. 
While (arg c & gt; 0 {
P++; 
Printf (" % s \ n ", p);//also shouldn't be here argv, should also be argv [0] orargv 
 [I]?Arg c -; 
} 

 int I=0; 

While (I & lt; Arg c) {
Printf (" % s \ n ", argv [I]); 
i++; 
} 

For your reference ~

CodePudding user response:

That is when the system calls will not pass argv first address to the main function is, in the program will still have to define a pointer to argv first address right

CodePudding user response:

Argv equivalent & amp; Argv [I], in order to achieve a result, the upstairs need
Printf (" % s \ n ", * argv);