Read Command-Line Arguments: Difference between revisions

{{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.)

=={{header|C}}==

<pre>

#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;

}

</pre>

=={{header|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;

}

=={{header|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

=={{header|Java}}==

public class CmdLine{

public static void main(String[] args){

System.out.println("Number of args: " + args.length);

for(int i= 0;i < args.length;i++)

System.out.println("Argument #" + (i+1) + ": " + args[i]);

}

}

=={{header|Perl}}==

#!/usr/bin/perl

print "There are $#ARGV arguments.\n";

foreach $argnum ( 0 .. $#ARGV )

{

print "Argument $argnum is $ARGV[$argnum].\n";

}