Creating implementation for idiom 60 : Read command line argument

Idiom

# 60 Read command line argument

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Lead paragraph

Assign to x the string value of the first command line parameter, after the program name.

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Other implementations

void main(int argc, char *argv[])
{
    char *x = argv[1];
}

int main(int argc, char *argv[])
{
 vector<string> args(1 + argv, argc + argv);

 string x = args.at(0);
}

static void Main(string[] args)
{
    string x = args[0];
}

auto x = args[1];

main(args) {
  var x = args[0];
}

  character(len=:), allocatable :: x
  integer :: n
  call get_command_argument (1, length=n)
  allocate (character(n):: x)
  call get_command_argument (1, x)

import "os"

x := os.Args[1]

x <- return.head =<< System.Environment.getArgs

const x = process.argv[2]

String x = args[0];

x = arg[1]

$x = $argv[1];

var
  _x: String;
begin
  _x := ParamString(1);
end.

$x = $ARGV[0];

import sys

x = sys.argv[1]

x = ARGV.first

use std::env;

let first_arg = env::args().skip(1).next();

let fallback = "".to_owned();
let x = first_arg.unwrap_or(fallback);

Demo

use std::env;

let x = env::args().nth(1).unwrap_or("".to_string());

Demo

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