Conditional Statements in Java

Conditional statements allow your code to make decisions based on certain conditions. The most common conditional statements in Java are if, if-else, and switch.

Akali vestundi, if(Opika unte) cook maggi else { paduko } , oka decision thiskovadaniki manam e conditional statements ni use chestam.

Code examples clear ga telugu lo untai, try to understand.

1. if Statement

The if statement evaluates a condition. If the condition is true, the code block within the if statement is executed.

int attendence = 75;

if (attendece >= 75) {
    System.out.println("Intlo hayiga padukundam");
}

2. if-else Statement

The if-else statement provides an alternative action if the condition is false.

int attendence = 70;

if (attendece >= 75) {
    System.out.println("Intlo hayiga padukundam");
} else {
    System.out.println("Thakuva aithe kastam!");
}

3. if-else-if Ladder

The if-else-if ladder allows multiple conditions to be evaluated in sequence.

int attendence = 40;

if (attendence >= 75) {
    System.out.println("Intlo hayiga padukundam");
} else if (attendence >= 50) {
    System.out.println("Thakuva aithe kastam!");
} else {
    System.out.println("Nanna, nuvu intiki rara ni pani cheptha..");
}

4. switch Statement

The switch statement allows you to choose between multiple options based on the value of a variable.

mari akuva else if raste pedhaga aipothadi kadha, dini alternative ga use chestham

int day = 3;

switch (day) {
    case 1:
        System.out.println("Sunday, Movie chudham");
        break;
    case 2:
        System.out.println("Monday, College povali");
        break;
    case 3:
        System.out.println("Tuesday, Jai Hanuman");
        break;
    default:
        System.out.println("Invalid day, naku ardam kaledhu sarr..");
        break;
}

Conditional (Ternary) Operator

The conditional (ternary) operator is a shorthand way of writing an if-else statement.

if else ni oka line lo rayadaniki shortcut.

indulo (= , ? , : )e 3 operators use chestham kabati ternary antaru.

variable = (condition) ? True_value : False_value;

Example:

int number = 10;
String result = (number > 0) ? "Positive" : "Negative";
System.out.println(result);

Problems to Solve

1. Problem 1: Check Leap Year

   • Write a Java program to check whether a year is a leap year or not.

   • Hint: A leap year is divisible by 4 but not by 100 unless it is also divisible by 400.

2. Problem 2: Find the Largest Number

   • Write a Java program to find the largest of three numbers using conditional statements.

3. Problem 3: Simple Calculator Using switch

   • Write a Java program to create a simple calculator that can perform addition, subtraction, multiplication, and division based on user input using a switch statement.

4. Problem 4: Determine the Grade

   • Write a Java program to determine the grade of a student based on their score. Use the following scale:

     • 90-100: A

     • 80-89: B

     • 70-79: C

     • 60-69: D

     • 0-59: F

5. Problem 5: Even or Odd

   • Write a Java program to check whether a given number is even or odd using the conditional (ternary) operator.