Parsing numeric arguments in Java - Practice Problems & Coding Challenges

trophy

Challenge - 5 Problems

💻 code output

intermediate

What is the output of parsing a valid integer string?

Consider the following Java code snippet that parses a string to an integer. What will be printed?

Java

public class Main {
    public static void main(String[] args) {
        String input = "123";
        int number = Integer.parseInt(input);
        System.out.println(number);
    }
}

A 123

B NumberFormatException

C 0

D null

💻 code output

intermediate

What happens when parsing a non-numeric string?

What will be the output or result of running this Java code?

Java

public class Main {
    public static void main(String[] args) {
        String input = "abc";
        int number = Integer.parseInt(input);
        System.out.println(number);
    }
}

A 0

B abc

C null

D NumberFormatException

💻 code output

advanced

Parsing a floating-point string with Integer.parseInt

What will happen when this code runs?

Java

public class Main {
    public static void main(String[] args) {
        String input = "12.34";
        int number = Integer.parseInt(input);
        System.out.println(number);
    }
}

A 12.34

B 12

C NumberFormatException

D 0

💻 code output

advanced

Parsing a floating-point string with Double.parseDouble

What will be the output of this Java code?

Java

public class Main {
    public static void main(String[] args) {
        String input = "12.34";
        double number = Double.parseDouble(input);
        System.out.println(number);
    }
}

A NumberFormatException

B 12.34

C 12

D 0.0

🧠 conceptual

expert

What is the value of 'result' after parsing with radix 16?

Given the code below, what is the value of the variable 'result' after execution?

Java

public class Main {
    public static void main(String[] args) {
        String hex = "1A";
        int result = Integer.parseInt(hex, 16);
        System.out.println(result);
    }
}

A 26

B 1A

C 16

D NumberFormatException