Idiom #22 Convert string to integer

Extract integer value i from its string representation s (in radix 10)

std::string s("123");
int i;
std::from_chars(s.data(), s.data() + s.size(), i, 10);

#include <string>

int i = std::stoi(s);

#include <string>
#include <sstream>

std::stringstream ss(str);
int i;
ss >> i;

#include <cstdlib>

int i = std::atoi(s);

I := Integer'Value (s);

#include <stdlib.h>

int i = atoi(s);

(Integer. s)

(Integer/parseInt s)

int i = int.Parse(s);

i = Convert.ToInt64(s);

import std.conv;

auto i = s.to!int;

var i = int.parse(s);

i = String.to_integer(s)

I = list_to_integer(S).

read (unit=s,fmt=*) i

import "strconv"

i, err := strconv.ParseInt(s, 10, 0)

import "strconv"

i, err  := strconv.Atoi(s)

let i = read s :: Integer

const i = +"12"

const i = Number(s);

i = parseInt("23", 10)

int i = Integer.parseInt(s);

int i = Integer.parseInt(s);

s.toInt()

val i = s.toInt()

(setf i (parse-integer s))

i = tonumber(s)

$i = intval($s, 10);

uses SysUtils;

i := StrToInt(S);

my $i = $s + 0;

i = int(s)

i = s.to_i

let i: i32 = s.parse().unwrap_or(0);

let i = s.parse::<i32>().unwrap();

let i = match s.parse::<i32>() {
  Ok(i) => i,
  Err(e) => {
    -1
  }
};

let num : i32 = line.trim().parse()
        .expect(msg: &str);

s.toInt

(define i (string->number s))

Dim myint As Integer = CInt(("123"))

Programming-Idioms