Java Operators

int a = 10;
int b = 5;
int sum = a + b;        // + is an operator
int product = a * b;    // * is an operator
boolean result = a > b; // > is an operator

System.out.println("Sum: " + sum);         // 15
System.out.println("Product: " + product); // 50
System.out.println("a > b: " + result);    // true

int a = 20;
int b = 7;

System.out.println("Addition: " + (a + b));       // 27
System.out.println("Subtraction: " + (a - b));    // 13
System.out.println("Multiplication: " + (a * b)); // 140
System.out.println("Division: " + (a / b));       // 2 (integer division)
System.out.println("Modulus: " + (a % b));        // 6 (remainder)

// Division with doubles
double x = 20.0;
double y = 7.0;
System.out.println("Double division: " + (x / y)); // 2.857142857142857

int a = 10;
int b = -a;   // Unary minus: b = -10
int c = +a;   // Unary plus: c = 10 (no change)

System.out.println("a: " + a);  // 10
System.out.println("b: " + b);  // -10
System.out.println("c: " + c);  // 10

boolean isTrue = true;
boolean isFalse = !isTrue;  // NOT operator

System.out.println("isTrue: " + isTrue);     // true
System.out.println("isFalse: " + isFalse);   // false
System.out.println("!isFalse: " + !isFalse); // true

int x = 10;

x += 5;   // x = x + 5 → x = 15
System.out.println("After += : " + x);

x -= 3;   // x = x - 3 → x = 12
System.out.println("After -= : " + x);

x *= 2;   // x = x * 2 → x = 24
System.out.println("After *= : " + x);

x /= 4;   // x = x / 4 → x = 6
System.out.println("After /= : " + x);

x %= 5;   // x = x % 5 → x = 1
System.out.println("After %= : " + x);

int a = 10;
int b = 5;

System.out.println("a == b: " + (a == b)); // false
System.out.println("a != b: " + (a != b)); // true
System.out.println("a > b: " + (a > b));   // true
System.out.println("a < b: " + (a < b));   // false
System.out.println("a >= b: " + (a >= b)); // true
System.out.println("a <= b: " + (a <= b)); // false

// Common usage in conditions
if (a > b) {
    System.out.println("a is greater than b");
}

int age = 25;
boolean hasLicense = true;

// Both conditions must be true
if (age >= 18 && hasLicense) {
    System.out.println("Can drive");
}

// Truth table for AND
System.out.println(true && true);   // true
System.out.println(true && false);  // false
System.out.println(false && true);  // false
System.out.println(false && false); // false

boolean isWeekend = false;
boolean isHoliday = true;

// At least one condition must be true
if (isWeekend || isHoliday) {
    System.out.println("No work today!");
}

// Truth table for OR
System.out.println(true || true);   // true
System.out.println(true || false);  // true
System.out.println(false || true);  // true
System.out.println(false || false); // false

boolean isRaining = false;

// Reverses the boolean value
if (!isRaining) {
    System.out.println("Go for a walk!");
}

System.out.println(!true);   // false
System.out.println(!false);  // true

boolean isReady = true;
System.out.println("Not ready: " + !isReady);  // false

condition ? valueIfTrue : valueIfFalse;

int age = 20;

// Ternary operator
String status = (age >= 18) ? "Adult" : "Minor";
System.out.println(status);  // Adult

// Equivalent if-else
String status2;
if (age >= 18) {
    status2 = "Adult";
} else {
    status2 = "Minor";
}

// More examples
int a = 10, b = 20;
int max = (a > b) ? a : b;
System.out.println("Max: " + max);  // 20

int num = 7;
String type = (num % 2 == 0) ? "Even" : "Odd";
System.out.println(num + " is " + type);  // 7 is Odd

int result = 10 + 5 * 2;
// Multiplication happens first: 5 * 2 = 10
// Then addition: 10 + 10 = 20
System.out.println(result);  // 20

// Use parentheses to change order
int result2 = (10 + 5) * 2;
// Parentheses first: 10 + 5 = 15
// Then multiplication: 15 * 2 = 30
System.out.println(result2);  // 30

public class OperatorDemo {
    public static void main(String[] args) {
        // Arithmetic operators
        int a = 20, b = 10;
        System.out.println("=== Arithmetic ===");
        System.out.println("a + b = " + (a + b));
        System.out.println("a - b = " + (a - b));
        System.out.println("a * b = " + (a * b));
        System.out.println("a / b = " + (a / b));
        System.out.println("a % b = " + (a % b));
        
        // Unary operators
        System.out.println("\n=== Unary ===");
        int x = 5;
        System.out.println("x++ = " + (x++));  // 5, then x=6
        System.out.println("x = " + x);        // 6
        System.out.println("++x = " + (++x));  // 7
        System.out.println("x = " + x);        // 7
        
        // Relational operators
        System.out.println("\n=== Relational ===");
        System.out.println("a > b: " + (a > b));
        System.out.println("a == b: " + (a == b));
        System.out.println("a != b: " + (a != b));
        
        // Logical operators
        System.out.println("\n=== Logical ===");
        boolean p = true, q = false;
        System.out.println("p && q: " + (p && q));
        System.out.println("p || q: " + (p || q));
        System.out.println("!p: " + (!p));
        
        // Ternary operator
        System.out.println("\n=== Ternary ===");
        int age = 20;
        String status = (age >= 18) ? "Adult" : "Minor";
        System.out.println("Status: " + status);
        
        // Assignment operators
        System.out.println("\n=== Assignment ===");
        int y = 10;
        y += 5;  // y = y + 5
        System.out.println("After += 5: " + y);
        y *= 2;  // y = y * 2
        System.out.println("After *= 2: " + y);
    }
}