This mini-project will provide a menu-driven program where the user can choose various number-related operations like printing number series, factorial, Fibonacci, reverse number, summation, and more.
Project: Number Operations System
Key Features:
- Print Number Series (Using loops)
- Factorial of a Number
- Fibonacci Series up to a given number
- Print Table of a Given Number
- Reverse a Number
- Find the Maximum Digit in a Number
- Summation of Digits
- Summation of First and Last Digits
- Day of the Week (using switch-case)
- Arithmetic Operations (Addition, Subtraction, Multiplication, Division)
- Area Calculation (Triangle, Rectangle, Circle using
if-else) - Check Odd or Even
- Check Prime or Not
- Check Positive or Negative
- Check Leap Year or Not
Project Code:
import java.util.Scanner;
public class NumberOperationsSystem {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int choice;
do {
System.out.println("\n*** Number Operations System ***");
System.out.println("1. Print Numbers from 1 to 10");
System.out.println("2. Print Numbers from 51 to 60");
System.out.println("3. Print Numbers from 100 to 81 (Reverse Order)");
System.out.println("4. Find Factorial of a Number");
System.out.println("5. Print Fibonacci Series");
System.out.println("6. Print Table of a Given Number");
System.out.println("7. Print Number in Reverse Order");
System.out.println("8. Find Max Digit in a Number");
System.out.println("9. Summation of Digits");
System.out.println("10. Summation of First and Last Digit");
System.out.println("11. Display Day of the Week");
System.out.println("12. Perform Arithmetic Operations");
System.out.println("13. Find Area (Triangle, Rectangle, Circle)");
System.out.println("14. Check Odd or Even");
System.out.println("15. Check Prime or Not");
System.out.println("16. Check Positive or Negative");
System.out.println("17. Check Leap Year");
System.out.println("18. Exit");
System.out.print("Choose an option: ");
choice = scanner.nextInt();
switch (choice) {
case 1:
printNumbers1To10();
break;
case 2:
printNumbers51To60();
break;
case 3:
printNumbers100To81();
break;
case 4:
findFactorial();
break;
case 5:
printFibonacci();
break;
case 6:
printTable();
break;
case 7:
reverseNumber();
break;
case 8:
findMaxDigit();
break;
case 9:
summationOfDigits();
break;
case 10:
summationFirstAndLastDigit();
break;
case 11:
displayDayOfWeek();
break;
case 12:
arithmeticOperations();
break;
case 13:
findArea();
break;
case 14:
checkOddEven();
break;
case 15:
checkPrime();
break;
case 16:
checkPositiveNegative();
break;
case 17:
checkLeapYear();
break;
case 18:
System.out.println("Exiting...");
break;
default:
System.out.println("Invalid option! Please try again.");
}
} while (choice != 18);
scanner.close();
}
// Method to print numbers from 1 to 10 using for loop
public static void printNumbers1To10() {
for (int i = 1; i <= 10; i++) {
System.out.print(i + " ");
}
System.out.println();
}
// Method to print numbers from 51 to 60 using while loop
public static void printNumbers51To60() {
int i = 51;
while (i <= 60) {
System.out.print(i + " ");
i++;
}
System.out.println();
}
// Method to print numbers from 100 to 81 using do-while loop
public static void printNumbers100To81() {
int i = 100;
do {
System.out.print(i + " ");
i--;
} while (i >= 81);
System.out.println();
}
// Method to find factorial of a number
public static void findFactorial() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number to find its factorial: ");
int num = scanner.nextInt();
long factorial = 1;
for (int i = 1; i <= num; i++) {
factorial *= i;
}
System.out.println("Factorial of " + num + " is " + factorial);
}
// Method to print Fibonacci series up to a given number
public static void printFibonacci() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the limit for Fibonacci series: ");
int limit = scanner.nextInt();
int a = 0, b = 1;
System.out.print("Fibonacci series: " + a + " " + b + " ");
for (int i = 2; i < limit; i++) {
int next = a + b;
System.out.print(next + " ");
a = b;
b = next;
}
System.out.println();
}
// Method to print the table of a given number
public static void printTable() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number to print its table: ");
int num = scanner.nextInt();
for (int i = 1; i <= 10; i++) {
System.out.println(num + " x " + i + " = " + num * i);
}
}
// Method to reverse a number
public static void reverseNumber() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number to reverse: ");
int num = scanner.nextInt();
int reversed = 0;
while (num != 0) {
int digit = num % 10;
reversed = reversed * 10 + digit;
num /= 10;
}
System.out.println("Reversed number: " + reversed);
}
// Method to find the maximum digit in a number
public static void findMaxDigit() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
int maxDigit = 0;
while (num != 0) {
int digit = num % 10;
if (digit > maxDigit) {
maxDigit = digit;
}
num /= 10;
}
System.out.println("Max digit is: " + maxDigit);
}
// Method to find the summation of digits in a number
public static void summationOfDigits() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
int sum = 0;
while (num != 0) {
sum += num % 10;
num /= 10;
}
System.out.println("Summation of digits: " + sum);
}
// Method to find summation of first and last digit of a number
public static void summationFirstAndLastDigit() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
int lastDigit = num % 10;
while (num >= 10) {
num /= 10;
}
int firstDigit = num;
System.out.println("Summation of first and last digit: " + (firstDigit + lastDigit));
}
// Method to display day of the week using switch-case
public static void displayDayOfWeek() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number (1 for Monday, 7 for Sunday): ");
int day = scanner.nextInt();
switch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
break;
case 7:
System.out.println("Sunday");
break;
default:
System.out.println("Invalid day number!");
}
}
// Method for arithmetic operations using switch-case
public static void arithmeticOperations() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter two numbers: ");
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
System.out.println("Choose an operation:");
System.out.println("1. Addition\n2. Subtraction\n3. Multiplication\n4. Division");
int operation = scanner.nextInt();
switch (operation) {
case 1:
System.out.println("Sum: " + (num1 + num2));
break;
case 2:
System.out.println("Difference: " + (num1 - num2));
break;
case 3:
System.out.println("Product: " + (num1 * num2));
break;
case 4:
if (num2 != 0) {
System.out.println("Quotient: " + (num1 / num2));
} else {
System.out.println("Division by zero error!");
}
break;
default:
System.out.println("Invalid operation!");
}
}
// Method to find the area of a shape using if conditions
public static void findArea() {
Scanner scanner = new Scanner(System.in);
System.out.println("Choose shape to find area:");
System.out.println("1. Triangle\n2. Rectangle\n3. Circle");
int shape = scanner.nextInt();
if (shape == 1) {
System.out.print("Enter base and height of triangle: ");
double base = scanner.nextDouble();
double height = scanner.nextDouble();
System.out.println("Area of Triangle: " + (0.5 * base * height));
} else if (shape == 2) {
System.out.print("Enter length and breadth of rectangle: ");
double length = scanner.nextDouble();
double breadth = scanner.nextDouble();
System.out.println("Area of Rectangle: " + (length * breadth));
} else if (shape == 3) {
System.out.print("Enter radius of circle: ");
double radius = scanner.nextDouble();
System.out.println("Area of Circle: " + (Math.PI * radius * radius));
} else {
System.out.println("Invalid shape choice!");
}
}
// Method to check if a number is odd or even
public static void checkOddEven() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
if (num % 2 == 0) {
System.out.println(num + " is even.");
} else {
System.out.println(num + " is odd.");
}
}
// Method to check if a number is prime
public static void checkPrime() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
boolean isPrime = true;
if (num <= 1) {
isPrime = false;
} else {
for (int i = 2; i <= Math.sqrt(num); i++) {
if (num % i == 0) {
isPrime = false;
break;
}
}
}
if (isPrime) {
System.out.println(num + " is prime.");
} else {
System.out.println(num + " is not prime.");
}
}
// Method to check if a number is positive or negative
public static void checkPositiveNegative() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = scanner.nextInt();
if (num > 0) {
System.out.println(num + " is positive.");
} else if (num < 0) {
System.out.println(num + " is negative.");
} else {
System.out.println("The number is zero.");
}
}
// Method to check if a year is a leap year
public static void checkLeapYear() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a year: ");
int year = scanner.nextInt();
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
System.out.println(year + " is a leap year.");
} else {
System.out.println(year + " is not a leap year.");
}
}
}Explanation:
- Menu-driven structure: The program displays a menu and prompts the user to choose an operation. It uses a
do-whileloop to keep the program running until the user chooses to exit. - Switch-case: It handles user choices efficiently, each case executing a different number operation.
- Number operations: The program performs common number operations like factorial, Fibonacci series, reverse digits, and finding the maximum digit.
- Basic arithmetic: It also allows users to perform addition, subtraction, multiplication, and division based on their choice.
- Area calculation: For geometric calculations (triangle, rectangle, and circle), the program uses
if-elseconditions. - Number property checks: Includes checking for odd/even, prime, positive/negative, and leap years.
How to Use:
- Run the Java program.
- Choose an option by entering the corresponding number.
- Perform various number-related tasks based on the user input.
- The program loops until you select “18. Exit”.
Conclusion
This java mini project covers all the necessary topics like loop, switch case, variable declarations and many more. We will see more details of another project and tutorial in upcoming articles.