/**
 * Basic Java type/operator/function demo.
 * 
 * @author Sean Barker
 */
public class Lec2 {
   
    /**
     * Adds two ints together.
     * 
     * @param num1 The first number.
     * @param num2 The second number.
     * @return The sum of the two numbers.
     */
    public static int addTwoNumbers(int num1, int num2) {
       return num1 + num2;
    }
    
    /**
     * Prints the sum of two numbers.
     * 
     * @param num1 The first number.
     * @param num2 The second number.
     */
    public static void printSum(int num1, int num2) {
        System.out.println(num1 + num2);
    }
    
    /**
     * Entry function to the program.
     */
    public static void main(String[] args) {

        // primitive types (lowercase)
        // not full objects -- operators, not methods
        int x = 0;
        double d = 8.52;
        boolean b = true;
        char c = 'x';
        
        // reference types (uppercase)
        // first-class objects -- methods
        String str = "Bowdoin College";
        
        int strLen = str.length(); // calling a method
        
        // Arithmetic operators
        // +, -, *, /, %
     
        int counter = 0;
        counter++; // same as counter += 1
        counter--; // same as counter -= 1
        
        // Relational operators
        // < <= > >= == !=
        
        boolean b1 = true;
        boolean b2 = false;
        
        boolean andTest = b1 && b2; // true if both b1 and b2 are true
        boolean orTest = b1 || b2; // true if either b1 or b2 is true
        boolean notTest = !b1; // true if b1 is false
        
        String s = "\tfirst line\nsecond line"; // escape sequences
        
        String part1 = "Bowdoin";
        String part2 = "College";
        String name = part1 + " " + part2; // string concatenation
        
        String s1 = "abc";
        String s2 = "xyz";
        boolean stringsEqual = s1.equals(s2); // NOT s1 == s2
        
        // null indicates a reference variable with no assigned object
        String some_str = null;
    }

}