Line Command Arguments
Command Line Arguments
In C++ it is possible to accept commandline arguments. To pass command-line arguments into your program, C++ has a special argument list for main( ), which looks like this: int main(int argc, char* argv[]) { ... }
The first argument (argc) is the number of elements in the array argv, which is the second argument. The second argument, argv is always an array of char*, because the arguments are passed from the command line as character arrays (an array can be passed only as a pointer). Each whitespace-delimited cluster of characters on the command line is turned into a separate array argument.
The following prints program out all its command-line arguments by stepping through the array: #include <iostream> using namespace std; int main(int argc, char* argv[]) { cout << "argc = " << argc << endl; for(int i = 0; i < argc; i++) cout << "argv[" << i << "] = " << argv[i] << endl; return 0; }
Notice that argv[0...