• Lisp

(setf n (read-from-string (remove-if-not #'digit-char-p (read-line))))

• C

int n[15];
fgets(n, 15, stdin);

• C

int n;
scanf("%d", &n);

• Clojure

(def n (Integer/parseInt (read-line)))

• Cobol

IDENTIFICATION DIVISION.
PROGRAM-ID. stdin.
PROCEDURE DIVISION.
    ACCEPT n
STOP RUN.

• C++

std::cin >> n;

• C#

n = int.Parse(Console.ReadLine());

• D

readf("%d", &n);

• Dart

String? s = stdin.readLineSync();  
int? n = int.tryParse(s ?? "");

• Elixir

n = String.to_integer IO.gets ""

• Fortran

   integer :: n
   read (*,*) n

• Go

_, err := fmt.Scan(&n)

• Go

_, err := fmt.Scanf("%d", &n)

• Haskell

n <- (read :: String -> Int) <$> getContents

• JS

const {createInterface} = require('readline')

const rl = createInterface ({
  input: process.stdin,
  output: process.stdout
})

rl.question('Input an integer: ', response => {
  let n = parseInt (response)
  // stuff to be done with n goes here

  rl.close()
})

• Java

Scanner in = new Scanner(System.in);
int n = in.nextInt();

• Java

Scanner in = new Scanner(System.in);
n = in.nextInt();

• Lua

n = io.read("n")

• Obj-C

scanf("%d",&n);

• PHP

fscanf(STDIN, "%d\n", $n);

• Pascal

read(n);

• Perl

my $n = <> + 0;  # read a line from STDIN, add 0 to convert to int

• Python

n = int(input("Input Prompting String: "))

• Ruby

n = $stdin.gets.to_i

• Rust

let mut input = String::new();
io::stdin().read_line(&mut input).unwrap();
let n: i32 = input.trim().parse().unwrap();

• Rust

let n: i32 = std::io::stdin()
    .lock()
    .lines()
    .next()
    .expect("stdin should be available")
    .expect("couldn't read from stdin")
    .trim()
    .parse()
    .expect("input was not an integer");

• Rust

fn get_input() -> String {
    let mut buffer = String::new();
    std::io::stdin().read_line(&mut buffer).expect("Failed");
    buffer
}

let n = get_input().trim().parse::<i64>().unwrap();

• Rust

let n: i32 = read!();