- argc (ARGument Count) is int and stores number of command-line arguments passed by the user including the name of the program.
So if we pass a value to a program, value of argc would be 2 (one for argument and one for program name). - argv(ARGument Vector) is array of character pointers listing all the arguments.
- Argv[0] is the name of the program.
Example:
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
cout << "You have entered " << argc
<< " arguments:" << "\n";
for (int i = 0; i < argc; ++i)
cout << argv[i] << "\n";
return 0;
}
/** Input:
$ g++ mainreturn.cpp -o main
$ ./main geeks for geeks
**/
/** Output:
You have entered 4 arguments:
./main
geeks
for
geeks
**/
- If argument itself has a space then you can pass such arguments by putting them inside double quotes "" or single quotes ''.
Example:
$ ./a.out "First Second Third"
Program Name Is: ./a.out
Number Of Arguments Passed: 2
----Following Are The Command Line Arguments Passed----
argv[0]: ./a.out
argv[1]: First Second Third