Reading integer input in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read an integer from the user using Scanner.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int number = scanner.[1]();
        System.out.println("You entered: " + number);
    }
}

Drag options to blanks, or click blank then click option'

AnextLine

BnextDouble

CnextInt

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() which reads a whole line as a string.

Using nextDouble() which reads a decimal number.

The nextInt() method reads an integer value from the user input.

2fill in blank

medium

Complete the code to create a Scanner object to read input from the keyboard.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner [1] = new Scanner(System.in);
    }
}

Drag options to blanks, or click blank then click option'

Areader

Binput

Ckeyboard

Dscanner

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that conflicts with class names.

Using reserved keywords as variable names.

Variable names can be anything, but scanner is a common and clear choice.

3fill in blank

hard

Fix the error in the code to correctly read an integer from the user.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int number = scanner.[1]();
        System.out.println("Number: " + number);
    }
}

Drag options to blanks, or click blank then click option'

AnextDouble

BnextInt

CnextLine

DnextFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() and trying to assign to int causes errors.

Using nextDouble() when expecting an integer.

The method nextInt() reads an integer. Using nextLine() or others causes errors or wrong types.

4fill in blank

hard

Fill both blanks to read an integer and print it with a message.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner [1] = new Scanner(System.in);
        int num = [2].nextInt();
        System.out.println("You typed: " + num);
    }
}

Drag options to blanks, or click blank then click option'

Ascanner

Binput

Creader

Dkeyboard

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Forgetting to create the Scanner object.

Using the same variable name scanner to create and then call nextInt() is correct.

5fill in blank

hard

Fill all three blanks to read two integers and print their sum.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner [1] = new Scanner(System.in);
        int a = [2].nextInt();
        int b = [3].nextInt();
        System.out.println("Sum: " + (a + b));
    }
}

Drag options to blanks, or click blank then click option'

Ascanner

Binput

Creader

Dkeyboard

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for reading inputs.

Not creating the Scanner object before reading.

Use the same Scanner variable scanner to read both integers.