A lot of new programmer wonder what are the arguments passed to main. I am going to tell you about them.
The program has two argument in main as in
main(int argc, char *argv[]).
basically, argc is an integer that contains the number of
arguments passed to the program and argv is an array of the arguments that was
passed.
argv[0] is always the program name itself.
#include <iomanip>
#include <iostream>
using namespace std;
int main( int argc, char* argv[] )
{
cout << "The name used to start the program: " << argv[ 0 ]
<< "\nArguments are:\n";
for (int n = 1; n < argc; n++)
cout << setw( 2 ) << n << ": " << argv[ n ] << '\n';
return 0;
}
If you compile this from the command line and enter:
D:\prog\test> a Hello world!
Output:
The name used to start the program: a
Arguments are:
1: Hello
2: world!