**1.** Write a Java program to get a number from the user and print whether it is positive or negative. Go to the editor

*Test Data*

Input number: 35

*Expected Output* :

Number is positive

Click me to see the solution

**2.** Write a Java program to solve quadratic equations (use if, else if and else). Go to the editor

*Test Data*

Input a: 1

Input b: 5

Input c: 1

*Expected Output* :

The roots are -0.20871215252208009 and -4.7912878474779195

Click me to see the solution

**3. ** Take three numbers from the user and print the greatest number. Go to the editor

*Test Data*

Input the 1st number: 25

Input the 2nd number: 78

Input the 3rd number: 87

*Expected Output* :

The greatest: 87

Click me to see the solution

**4.** Write a Java program that reads a floating-point number and prints "zero" if the number is zero. Otherwise, print "positive" or "negative". Add "small" if the absolute value of the number is less than 1, or "large" if it exceeds 1,000,000. Go to the editor

*Test Data*

Input value: 25

*Expected Output* :

Positive number

**5.** Write a Java program that keeps a number from the user and generates an integer between 1 and 7 and displays the name of the weekday. Go to the editor

*Test Data*

Input number: 3

*Expected Output* :

Wednesday

**6.** Write a Java program that reads in two floating-point numbers and tests whether they are the same up to three decimal places. Go to the editor

*Test Data*

Input floating-point number: 1256

Input floating-point another number: 3254

*Expected Output* :

They are different

**7.** Write a Java program to find the number of days in a month. Go to the editor

*Test Data*

Input a month number: 2

Input a year: 2016

*Expected Output* :

February 2016 has 29 days

**8.** Write a Java program that takes the user to provide a single character from the alphabet. Print Vowel or Consonant, depending on the user input. If the user input is not a letter (between a and z or A and Z), or is a string of length > 1, print an error message. Go to the editor

*Test Data*

Input an alphabet: p

*Expected Output* :

Input letter is Consonant

**9.** Write a Java program that takes a year from user and print whether that year is a leap year or not. Go to the editor

*Test Data*

Input the year: 2016

*Expected Output* :

2016 is a leap year

**10.** Write a program in Java to display the first 10 natural numbers. Go to the editor

*Expected Output* :

The first 10 natural numbers are: 1 2 3 4 5 6 7 8 9 10

**11.** Write a program in Java to display n terms of natural numbers and their sum. Go to the editor

*Test Data*

Input the number: 2

*Expected Output* :

Input number: 2 The first n natural numbers are : 2 1 2 The Sum of Natural Number upto n terms : 23

**12.** Write a program in Java to input 5 numbers from keyboard and find their sum and average. Go to the editor

*Test Data*

Input the 5 numbers :
1
2
3
4
5

*Expected Output* :

Input the 5 numbers : 1 2 3 4 5 The sum of 5 no is : 15 The Average is : 3.0

**13.** Write a program in Java to display the cube of the number upto given an integer. Go to the editor

*Test Data*

Input number of terms : 4

*Expected Output* :

Number is : 1 and cube of 1 is : 1 Number is : 2 and cube of 2 is : 8 Number is : 3 and cube of 3 is : 27 Number is : 4 and cube of 4 is : 64

**14.** Write a program in Java to display the multiplication table of a given integer. Go to the editor

*Test Data*

Input the number (Table to be calculated) : Input number of terms : 5

*Expected Output* :

5 X 0 = 0 5 X 1 = 5 5 X 2 = 10 5 X 3 = 15 5 X 4 = 20 5 X 5 = 25

**15.** Write a program in Java to display the n terms of odd natural number and their sum. Go to the editor

*Test Data*

Input number of terms is: 5

*Expected Output* :

The odd numbers are : 1 3 5 7 9 The Sum of odd Natural Number upto 5 terms is: 25

**16.** Write a program in Java to display the pattern like right angle triangle with a number. Go to the editor

*Test Data*

Input number of rows : 10

*Expected Output* :

1 12 123 1234 12345 123456 1234567 12345678 123456789 12345678910

**17.** Write a program in Java to make such a pattern like right angle triangle with a number which will repeat a number in a row.The pattern is as follows : Go to the editor

1 22 333 4444

**18.** Write a program in Java to make such a pattern like right angle triangle with number increased by 1.The pattern like : Go to the editor

1 2 3 4 5 6 7 8 9 10

**19.** Write a program in Java to make such a pattern like a pyramid with a number which will repeat the number in the same row. Go to the editor

1 2 2 3 3 3 4 4 4 4

**20.** Write a program in Java to print the Floyd's Triangle. Go to the editor

*Test Data*

Input number of rows : 5

*Expected Output* :

1 01 101 0101 10101

**21.** Write a program in Java to display the pattern like a diamond. Go to the editor

*Test Data*

Input number of rows (half of the diamond) : 7

*Expected Output* :

* *** ***** ******* ********* *********** ************* *********** ********* ******* ***** *** *

**22. ** Write a Java program to display Pascal's triangle. Go to the editor

*Test Data*

Input number of rows: 5

*Expected Output* :

Input number of rows: 5 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1

**23. ** Write a java program to generate a following *'s triangle. Go to the editor

*Test Data*

Input the number: 6

*Expected Output* :

****** ***** **** *** ** *

**24. ** Write a java program to generate a following @'s triangle. Go to the editor

*Test Data*

Input the number: 6

*Expected Output* :

@ @@ @@@ @@@@ @@@@@ @@@@@@

**25. ** Write a Java program to display the number rhombus structure. Go to the editor

*Test Data*

Input the number: 7

*Expected Output* :

1 212 32123 4321234 543212345 65432123456 7654321234567 65432123456 543212345 4321234 32123 212 1

**26. ** Write a Java program to display the following character rhombus structure. Go to the editor

*Test Data*

Input the number: 7

*Expected Output* :

A ABA ABCBA ABCDCBA ABCDEDCBA ABCDEFEDCBA ABCDEFGFEDCBA ABCDEFEDCBA ABCDEDCBA ABCDCBA ABCBA ABA A

**27. ** Write a Java program that reads an integer and check whether it is negative, zero, or positive. Go to the editor

*Test Data*

Input a number: 7

*Expected Output* :

Number is positive

**28. ** Write a Java program that reads a floating-point number. If the number is zero it prints "zero", otherwise, print "positive" or "negative". Add "small" if the absolute value of the number is less than 1, or "large" if it exceeds 1,000,000. Go to the editor

*Test Data*

Input a number: -2534

*Expected Output* :

Negative

**29. ** Write a Java program that reads an positive integer and count the number of digits the number (less than ten billion) has. Go to the editor

*Test Data*

Input an integer number less than ten billion: 125463

*Expected Output* :

Number of digits in the number: 6

**30. ** Write a Java program that accepts three numbers and prints "All numbers are equal" if all three numbers are equal, "All numbers are different" if all three numbers are different and "Neither all are equal or different" otherwise. Go to the editor

*Test Data*

Input first number: 2564

Input second number: 3526

Input third number: 2456

*Expected Output* :

All numbers are different

**31. ** Write a program that accepts three numbers from the user and prints "increasing" if the numbers are in increasing order, "decreasing" if the numbers are in decreasing order, and "Neither increasing or decreasing order" otherwise. Go to the editor

*Test Data*

Input first number: 1524

Input second number: 2345

Input third number: 3321

*Expected Output* :

Increasing order

**32. ** Write a Java program that accepts two floatingpoint numbers and checks whether they are
the same up to two decimal places. Go to the editor

*Test Data*

Input first floatingpoint number: 1235

Input second floatingpoint number: 2534

*Expected Output* :

These numbers are different.

**List of Exercises with Solutions :**

- HTML CSS Exercises, Practice, Solution
- JavaScript Exercises, Practice, Solution
- jQuery Exercises, Practice, Solution
- jQuery-UI Exercises, Practice, Solution
- CoffeeScript Exercises, Practice, Solution
- Twitter Bootstrap Exercises, Practice, Solution
- C Programming Exercises, Practice, Solution
- C# Sharp Programming Exercises, Practice, Solution
- PHP Exercises, Practice, Solution
- Python Exercises, Practice, Solution
- Java Exercises, Practice, Solution
- SQL Exercises, Practice, Solution
- MySQL Exercises, Practice, Solution
- PostgreSQL Exercises, Practice, Solution
- SQLite Exercises, Practice, Solution
- MongoDB Exercises, Practice, Solution
- Euler Project

**Join our Question Answer community to learn and share your programming knowledge.**

**Solve these problems:**

**Java: ** How to convert a string to an integer in Java?

**SQL: ** JOIN using more than 5 tables