Java_Class_1_Basics_Questions_Solutions (1).pptx

Java_Class_1_Basics_Questions_Solutions (1).pptx

• 1.
  Java Basics Data Types,Variables, Operators, Control Statements (if/switch)
• 2.
  Data Types inJava • Java has two categories of data types: • • Primitive: byte, short, int, long, float, double, char, boolean • Example: int age = 25; char grade = 'A'; • • Non-Primitive: Arrays, Strings, Classes, Interfaces • Example: String name = "Ashish";
• 3.
  Variables in Java •Variables store data for processing. • • Syntax: dataType variableName = value; • Example: int count = 10; • • Types: Local, Instance, Static
• 4.
  Constants and finalKeyword • The 'final' keyword makes variables constant. • • Syntax: final dataType varName = value; • Example: final double PI = 3.1416;
• 5.
  Operators in Java •Java provides different types of operators: • • Arithmetic: +, -, *, /, % • • Relational: ==, !=, >, <, >=, <= • • Logical: &&, ||, ! • • Assignment: =, +=, -=, *=, /= • • Unary: +, -, ++, --
• 6.
  Control Statements: if& if-else • Used for decision-making: • • Syntax: • if (condition) { • // code • } else { • // code • } • • Example: • int age = 18;
• 7.
  Switch Statement • Useswitch for multiple condition checks: • • Syntax: • switch(expression) { • case value: // code; break; • ... • } • • Example: • int day = 2; • switch(day) {
• 8.
  Sample Program: GradeCalculator • Example: • int marks = 85; • if (marks >= 90) { • System.out.println("A"); • } else if (marks >= 80) { • System.out.println("B"); • }
• 9.
  Sample Program: Calculatorusing switch • Example: • int a = 10, b = 5; • char op = '+'; • switch(op) { • case '+': System.out.println(a+b); break; ... }
• 10.
  Practice Questions • 1.Write a program to check if a number is positive or negative. • 2. Create a calculator using switch case. • 3. Write a program to print grade based on marks.
• 11.
  Summary • • Javadata types: Primitive and Non-Primitive • • Declaring and using variables • • Operators and their types • • if, if-else, and switch-case statements • • Sample problems and questions
• 12.
  Q1: Check Evenor Odd • Problem: Write a Java program to check if a number is even or odd. • Solution: • int num = 10; • if (num % 2 == 0) { • System.out.println("Even"); • } else { • System.out.println("Odd");
• 13.
  Q2: Find Maximumof 3 Numbers • Problem: Write a Java program to find the largest of three numbers. • Solution: • int a = 5, b = 10, c = 8; • int max = a; • if (b > max) max = b; • if (c > max) max = c; • System.out.println("Max: " + max);
• 14.
  Q3: Simple Calculator •Problem: Perform addition, subtraction, multiplication, and division using switch. • Solution: • int a = 20, b = 4; • char op = '/'; • switch(op) { • case '+': System.out.println(a + b); break; • case '-': System.out.println(a - b); break;
• 15.
  Q4: Grading System •Problem: Print grade based on marks. • Solution: • int marks = 72; • if (marks >= 90) System.out.println("Grade A"); • else if (marks >= 80) System.out.println("Grade B"); • else if (marks >= 70) System.out.println("Grade C");
• 16.
  Q5: Positive, Negative,or Zero • Problem: Check whether a number is positive, negative, or zero. • Solution: • int num = -5; • if (num > 0) System.out.println("Positive"); • else if (num < 0) System.out.println("Negative"); • else System.out.println("Zero");