# Java Conditional Statement : Exercises, Practice, Solution

## Java Conditional Statement Exercises [32 exercises with solution]

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

*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).

*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.** Write a Java program that takes three numbers from the user and prints the greatest number.

*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.

*Test Data*

Input a number: 25

*Expected Output* :

Input value: 25

Positive number

**5.** Write a Java program that takes a number from the user and generates an integer between 1 and 7. It displays the weekday name.

*Test Data*

Input number: 3

*Expected Output* :

Wednesday

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

*Test Data*

Input floating-point number: 25.586

Input floating-point another number: 25.589

*Expected Output* :

They are different

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

*Test Data*

Input a month number: 2

Input a year: 2016

*Expected Output* :

February 2016 has 29 days

**8.** Write a Java program that requires the user to enter a single character from the alphabet. Print Vowel or Consonant, depending on 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.

*Test Data*

Input an alphabet: p

*Expected Output* :

Input letter is Consonant

**9.** Write a Java program that takes a year from the user and prints whether it is a leap year or not.

*Test Data*

Input the year: 2016

*Expected Output* :

2016 is a leap year

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

*Expected Output* :

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

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

*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 the keyboard and find their sum and average.

*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 Java program to display the cube of the given number up to an integer.

*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 Java program to display the multiplication table of a given integer.

*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 Java program that displays the sum of n odd natural numbers.

*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 Java program to display the pattern like a right angle triangle with a number.

*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 a right angle triangle with a number which repeats a number in a row.

The pattern is as follows :

1 22 333 4444

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

The pattern like :

1 2 3 4 5 6 7 8 9 10

**19.** Write a Java program to make such a pattern like a pyramid with a number that repeats in the same row.

1 2 2 3 3 3 4 4 4 4

**20.** Write a Java program to print Floyd's Triangle.

*Test Data*

Input number of rows : 5

*Expected Output* :

Input number of rows : 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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

*Test Data*

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

*Expected Output* :

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

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

*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 the following * triangles.

*Test Data*

Input the number: 6

*Expected Output* :

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

**24.** Write a Java program to generate the following @'s triangle.

*Test Data*

Input the number: 6

*Expected Output* :

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

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

*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.

*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.

*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.

*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.

*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.

*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.

*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.

*Test Data*

Input first floatingpoint number: 1235

Input second floatingpoint number: 2534

*Expected Output* :

These numbers are different.

**Java Code Editor:**

**More to Come !**

**Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.**

## Java: Tips of the Day

** How do I remove repeated elements from ArrayList?**

If you don't want duplicates in a Collection, you should consider why you're using a Collection that allows duplicates. The easiest way to remove repeated elements is to add the contents to a Set (which will not allow duplicates) and then add the Set back to the ArrayList:

Set<String> set = new HashSet<>(yourList); yourList.clear(); yourList.addAll(set);

Of course, this destroys the ordering of the elements in the ArrayList.

Ref: https://bit.ly/3bYIjNC

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