Read Command-Line Arguments: Difference between revisions

From Rosetta Code
Content added Content deleted
(C version)
Line 1: Line 1:
{{duplicate}}
{{task}}Read the command line arguments, display the total number, and display each one, including any reference to the program itself. (i.e., if the language includes the name and path of the executable as one of the arguments, include it.)
{{task}}Read the command line arguments, display the total number, and display each one, including any reference to the program itself. (i.e., if the language includes the name and path of the executable as one of the arguments, include it.)



Revision as of 15:27, 2 December 2007

This page is a duplicate of another page. Its information should be merged with that of its sibling page. Please see the Talk page for details.
Task
Read Command-Line Arguments
You are encouraged to solve this task according to the task description, using any language you may know.

Read the command line arguments, display the total number, and display each one, including any reference to the program itself. (i.e., if the language includes the name and path of the executable as one of the arguments, include it.)

C

#include<stdio.h>

int main(int argc, char *argv[])
{
	int narg;

	printf("There are %d arguments\n", argc);
	for(narg=0; narg<argc; ++narg) 
		printf("Argument #%d is %s.\n", narg, argv[narg]);

	return 0;
}

C++

#include <iostream>
int main( int argc, char *argv[] )
{
     std::cout << "There are " << argc << " arguments." << std::endl;
     for (int argnum = 0; argnum < argc; ++argnum)
     {
          std::cout << "Argument #" << argnum << " is " << argv[argnum] << "." << std::endl;
     }

     return 0;  
}

Haskell

import System.Environment

main = do
  prog <- getProgName
  args <- getArgs
  putStrLn $ "Program name: " ++ prog
  putStrLn $ "There are " ++ show (length args) ++ " arguments:"
  forM_ (zip args [1..]) $ \(a,i) -> 
    putStrLn $ "Argument #" ++ show i ++ " is " ++ a

Perl

#!/usr/bin/perl

print "There are $#ARGV arguments.\n";
foreach $argnum ( 0 .. $#ARGV )
{
        print "Argument $argnum is $ARGV[$argnum].\n";
}