Output formatting basics in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, World!" to the console.

Java

System.out.[1]("Hello, World!");

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

Aoutput

Bprintln

Cwrite

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of println, so output stays on the same line.

Trying to use a method that doesn't exist like write or output.

The println method prints the text and moves to a new line.

2fill in blank

medium

Complete the code to format and print a floating-point number with two decimal places.

Java

System.out.printf("%.[1]f", 3.14159);

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A3

B1

C4

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 or 3 decimals instead of 2.

Forgetting the 'f' in the format specifier.

The %.2f format specifier prints a floating-point number with two decimals.

3fill in blank

hard

Fix the error in the code to print an integer padded with zeros to width 5.

Java

System.out.printf("%[1]d", 42);

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A05

B5

C-5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 5 without zero, which pads with spaces.

Using negative width which left-aligns but doesn't pad zeros.

The format specifier %05d pads the integer with zeros to make it 5 characters wide.

4fill in blank

hard

Fill both blanks to print a string left-aligned in a field of width 10.

Java

System.out.printf("%[1][2]s", "Hi");

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A-

B+

C10

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' which is not valid for string alignment.

Using width 5 which is too small for the example.

The %-10s format specifier prints the string left-aligned in a 10-character wide field.

5fill in blank

hard

Fill all three blanks to print a floating-point number right-aligned with width 8 and 3 decimals.

Java

System.out.printf("%[1][2][3]f", 7.12345);

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

A-

B8

C.3

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which left-aligns instead of right-aligning.

Forgetting the dot before the decimal count.

The format specifier %08.3f prints the number padded with zeros, width 8, and 3 decimals.