﻿ Java Exercises: Conditional Statement exercises - w3resource

# Java Conditional Statement : Exercises, Practice, Solution

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

[An editor is available at the bottom of the page to write and execute the scripts. Go to the editor]

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

Click me to see the solution

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

Click me to see the solution

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

Click me to see the solution

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

Click me to see the solution

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
```

Click me to see the solution

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```

Click me to see the solution

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 ```

Click me to see the solution

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.

﻿