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💻 Simple Grade Calculator (A, B, C, D, F)
import java.util.Scanner;
public class SimpleGradeCalculator {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter your marks: ");
int marks = input.nextInt();
char grade;
if (marks >= 90) {
grade = 'A';
} else if (marks >= 80) {
grade = 'B';
} else if (marks >= 70) {
grade = 'C';
} else if (marks >= 60) {
grade = 'D';
} else {
grade = 'F';
}
System.out.println("Your grade is: " + grade);
input.close();
}
}
Input: 85 Output: Enter your marks: Your grade is: B Input: 92 Output: Enter your marks: Your grade is: A Input: 55 Output: Enter your marks: Your grade is: F Input: 71 Output: Enter your marks: Your grade is: C Input: 60 Output: Enter your marks: Your grade is: D
💻 Find Maximum of Three Numbers
import java.util.Scanner;
public class FindMaximumOfThreeNumbers {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the first number: ");
int firstNumber = scanner.nextInt();
System.out.print("Enter the second number: ");
int secondNumber = scanner.nextInt();
System.out.print("Enter the third number: ");
int thirdNumber = scanner.nextInt();
int maximumNumber;
if (firstNumber >= secondNumber && firstNumber >= thirdNumber) {
maximumNumber = firstNumber;
} else if (secondNumber >= firstNumber && secondNumber >= thirdNumber) {
maximumNumber = secondNumber;
} else {
maximumNumber = thirdNumber;
}
System.out.println("The maximum number is: " + maximumNumber);
scanner.close();
}
}
Input: 10 Input: 5 Input: 15 Output: Enter the first number: Enter the second number: Enter the third number: The maximum number is: 15 Input: 2 Input: 2 Input: 2 Output: Enter the first number: Enter the second number: Enter the third number: The maximum number is: 2 Input: -5 Input: -10 Input: -1 Output: Enter the first number: Enter the second number: Enter the third number: The maximum number is: -1
💻 Check if String Starts with Vowel
import java.util.Scanner;
public class StringStartsWithVowel {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a string: ");
String inputString = scanner.nextLine();
if (inputString != null && !inputString.isEmpty()) {
char firstChar = Character.toLowerCase(inputString.charAt(0));
if (firstChar == 'a' || firstChar == 'e' || firstChar == 'i' || firstChar == 'o' || firstChar == 'u') {
System.out.println("The string starts with a vowel.");
} else {
System.out.println("The string does not start with a vowel.");
}
} else {
System.out.println("The string is empty.");
}
scanner.close();
}
}
Input: Apple Output: The string starts with a vowel. Input: Banana Output: The string does not start with a vowel. Input: umbrella Output: The string starts with a vowel. Input: Output: The string is empty. Input: Orange Output: The string starts with a vowel. Input: xyz Output: The string does not start with a vowel.
💻 Check if Number is Palindrome
import java.util.Scanner;
public class PalindromeNumberChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();
int originalNumber = number;
int reversedNumber = 0;
while (number > 0) {
int remainder = number % 10;
reversedNumber = reversedNumber * 10 + remainder;
number = number / 10;
}
if (originalNumber == reversedNumber) {
System.out.println(originalNumber + " is a palindrome number.");
} else {
System.out.println(originalNumber + " is not a palindrome number.");
}
scanner.close();
}
}
// Code not available
💻 Check if Character is Uppercase or Lowercase
import java.util.Scanner;
public class CheckCase {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a character: ");
char inputChar = scanner.next().charAt(0);
if (Character.isUpperCase(inputChar)) {
System.out.println("The character is uppercase.");
} else if (Character.isLowerCase(inputChar)) {
System.out.println("The character is lowercase.");
} else {
System.out.println("The character is not an alphabet.");
}
scanner.close();
}
}
Input: A Output: The character is uppercase. Input: a Output: The character is lowercase. Input: 5 Output: The character is not an alphabet. Input: $ Output: The character is not an alphabet.
💻 Check if Triangle is Valid
import java.util.Scanner;
public class TriangleValidator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the first angle of the triangle: ");
int angle1 = scanner.nextInt();
System.out.print("Enter the second angle of the triangle: ");
int angle2 = scanner.nextInt();
System.out.print("Enter the third angle of the triangle: ");
int angle3 = scanner.nextInt();
// Check if the sum of angles is 180
if (angle1 + angle2 + angle3 == 180) {
System.out.println("The triangle is valid.");
} else {
System.out.println("The triangle is not valid.");
}
scanner.close();
}
}
Input: 60 Input: 60 Input: 60 Output: The triangle is valid. Input: 90 Input: 45 Input: 45 Output: The triangle is valid. Input: 100 Input: 50 Input: 20 Output: The triangle is not valid.
💻 Check if Number is Prime
import java.util.Scanner;
public class PrimeNumberChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();
boolean isPrime = true;
if (number <= 1) {
isPrime = false;
} else {
for (int i = 2; i <= Math.sqrt(number); i++) {
if (number % i == 0) {
isPrime = false;
break;
}
}
}
if (isPrime) {
System.out.println(number + " is a prime number.");
} else {
System.out.println(number + " is not a prime number.");
}
scanner.close();
}
}
Input: 7 Output: 7 is a prime number. Input: 10 Output: 10 is not a prime number. Input: 1 Output: 1 is not a prime number. Input: 0 Output: 0 is not a prime number. Input: 2 Output: 2 is a prime number. Input: 4 Output: 4 is not a prime number.
💻 Check if Person is Eligible to Vote
import java.util.Scanner;
public class VotingEligibilityChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter your age: ");
int age = scanner.nextInt();
if (age >= 18) {
System.out.println("You are eligible to vote.");
} else {
System.out.println("You are not eligible to vote.");
}
scanner.close();
}
}
Input: 25 Output: Enter your age: You are eligible to vote. Input: 16 Output: Enter your age: You are not eligible to vote.
💻 Check Profit or Loss from Cost and Sell Price
import java.util.Scanner;
public class ProfitLossChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the cost price: ");
double costPrice = scanner.nextDouble();
System.out.print("Enter the selling price: ");
double sellingPrice = scanner.nextDouble();
if (sellingPrice > costPrice) {
double profit = sellingPrice - costPrice;
System.out.println("Profit of: " + profit);
} else if (costPrice > sellingPrice) {
double loss = costPrice - sellingPrice;
System.out.println("Loss of: " + loss);
} else {
System.out.println("No profit, no loss.");
}
scanner.close();
}
}
Input: 100 Input: 120 Output: Profit of: 20.0 Input: 100 Input: 80 Output: Loss of: 20.0 Input: 100 Input: 100 Output: No profit, no loss.
💻 Check if Character is Alphabet or Digit
import java.util.Scanner;
public class CheckAlphabetOrDigit {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a character: ");
char ch = scanner.next().charAt(0);
if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
System.out.println(ch + " is an alphabet.");
} else if (ch >= '0' && ch <= '9') {
System.out.println(ch + " is a digit.");
} else {
System.out.println(ch + " is neither an alphabet nor a digit.");
}
scanner.close();
}
}
Input: A Output: Enter a character: A is an alphabet. Input: 5 Output: Enter a character: 5 is a digit. Input: $ Output: Enter a character: $ is neither an alphabet nor a digit.
💻 Check if Number is Even or Odd
import java.util.Scanner;
public class EvenOddChecker {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter an integer: ");
int number = input.nextInt();
if (number % 2 == 0) {
System.out.println(number + " is an even number.");
} else {
System.out.println(number + " is an odd number.");
}
input.close();
}
}
Input: 4 Output: Enter an integer: 4 is an even number. Input: 7 Output: Enter an integer: 7 is an odd number.
💻 Check if Number is Positive or Negative
import java.util.Scanner;
public class PositiveNegativeCheck {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();
if (number > 0) {
System.out.println("The number is positive.");
} else if (number < 0) {
System.out.println("The number is negative.");
} else {
System.out.println("The number is zero.");
}
scanner.close();
}
}
Input: 10 Output: Enter a number: The number is positive. Input: -5 Output: Enter a number: The number is negative. Input: 0 Output: Enter a number: The number is zero.
💻 Check if Character is Alphabet
import java.util.Scanner;
public class AlphabetChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a character: ");
char inputChar = scanner.next().charAt(0);
if ((inputChar >= 'a' && inputChar <= 'z') || (inputChar >= 'A' && inputChar <= 'Z')) {
System.out.println(inputChar + " is an alphabet.");
} else {
System.out.println(inputChar + " is not an alphabet.");
}
scanner.close();
}
}
Input: A Output: Enter a character: A is an alphabet. Input: g Output: Enter a character: g is an alphabet. Input: 5 Output: Enter a character: 5 is not an alphabet. Input: $ Output: Enter a character: $ is not an alphabet.
💻 Check if Number is Perfect Square
import java.util.Scanner;
public class PerfectSquareCheck {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();
if (number < 0) {
System.out.println("The number is not a perfect square.");
} else {
double squareRoot = Math.sqrt(number);
if (squareRoot == Math.floor(squareRoot)) {
System.out.println("The number is a perfect square.");
} else {
System.out.println("The number is not a perfect square.");
}
}
scanner.close();
}
}
Input: 25 Output: The number is a perfect square. Input: 10 Output: The number is not a perfect square. Input: -9 Output: The number is not a perfect square.
💻 Check if Person is Adult
import java.util.Scanner;
public class AdultCheck {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the age of the person: ");
int age = scanner.nextInt();
if (age >= 18) {
System.out.println("The person is an adult.");
} else {
System.out.println("The person is not an adult.");
}
scanner.close();
}
}
Input: 25 Output: Enter the age of the person: The person is an adult. Input: 16 Output: Enter the age of the person: The person is not an adult. Input: 18 Output: Enter the age of the person: The person is an adult.
💻 Check if String is Empty
import java.util.Scanner;
public class StringIsEmptyChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a string: ");
String inputString = scanner.nextLine();
if (inputString.isEmpty()) {
System.out.println("The string is empty.");
} else {
System.out.println("The string is not empty.");
}
scanner.close();
}
}
Input: Hello Output: The string is not empty. Input: Output: The string is empty. Input: Output: The string is not empty.
💻 Check if Number is Divisible by 5
import java.util.Scanner;
public class DivisibleBy5Checker {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = input.nextInt();
if (number % 5 == 0) {
System.out.println(number + " is divisible by 5.");
} else {
System.out.println(number + " is not divisible by 5.");
}
input.close();
}
}
Input: 25 Output: 25 is divisible by 5. Input: 17 Output: 17 is not divisible by 5. Input: 0 Output: 0 is divisible by 5. Input: -10 Output: -10 is divisible by 5.
💻 Check if Temperature is Freezing
import java.util.Scanner;
public class CheckIfTemperatureIsFreezing {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the temperature in Celsius: ");
double temperatureInCelsius = scanner.nextDouble();
if (temperatureInCelsius < 0) {
System.out.println("The temperature is freezing!");
} else {
System.out.println("The temperature is not freezing.");
}
scanner.close();
}
}
Input: -5 Output: Enter the temperature in Celsius: The temperature is freezing! Input: 25 Output: Enter the temperature in Celsius: The temperature is not freezing. Input: 0 Output: Enter the temperature in Celsius: The temperature is not freezing.
