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Python

JavaScript

Java

C++

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a = '18'b = int(a) + 3print(b)​#Python

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const a = '18';const b = parseInt(a) + 3;console.log(b);​//JavaScript

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public class Main {  public static void main(String[] args) {    String a = "18";    int b = Integer.parseInt(a) + 3;    System.out.println(b);  }}​//Java

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#include <iostream>#include <string>using namespace std;​int main() {  string a = "18";  int b = stoi(a) + 3;  cout << b;    return 0;}​//C++

Python result:

JavaScript result:

Java result:

CPP result:

21

21

21

21