javaexamples/Review1.java at master · illinoistechesi/javaexamples · GitHub

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/*

  _____ ____ ___   ____   ___  _  ___
 | ____/ ___|_ _| |___ \ / _ \/ |( _ )
 |  _| \___ \| |    __) | | | | |/ _ \
 | |___ ___) | |   / __/| |_| | | (_) |
 |_____|____/___| |_____|\___/|_|\___/


 */
/* Exercise

    Warmup-1
	* NearHundred 	- abs value
	* backAround 	- substring,
	* missingChar 	- substring
	* startHi 		- substring, equals
	* or35			- mod operator
	* posNeg		- if-condition, logical operators
	* in3050		- if-condition, logical operators

*/


// Single line comment - text that are ignored by the compiler
// useful for marking down your code to explain what you are doing

/*
	Multi-line comment - for when things get real... complicated...
*/


/**** Naming conventions java files ****

	* The first character of a .java file is in uppercase
	* The class name below is the same as the file name
*/
public class Review1 {

	// point of entry for program execution when running the compiled java file
	public static void main(String[] args) {

		/**** Variables and Data types ****

			Initialization

			[Data Type] [Variable Name];
			[Data Type] [Variable Name] = [Initial Value(s)];

			After initialization, variables can be referred to using their names
		*/

		// Integer/int are whole numbers that can be between -2,147,483,648 to 2,147,483,647
		int drivingAge;
		int age = 46;
		drivingAge = 12;

		// Double are numbers with decimals that can be between ± 1.79769313486231570E+308
		Double salesTax;
		Double gasPrice = 3.48;
		salesTax = 0.12;

		// boolean values can be either true or false
		boolean isRaining;
		boolean weekend = true;
		isRaining = false;

		// Characters are variables that can only have one value using single quoutes ''
		char shirtSize = 'L';
		shirtSize = 'S';
		char gender;

		// Strings are words that includes any charaters
		String name;
		String favFood = "Waffles";
		name = "";

		// Java's class that allows printing text to terminal, useful to see your results and debugging
		System.out.println("My name is " + name + " and my favorite food is " + favFood + "!");
		System.out.println("I am " + age + " years old!");


		/**** Operators ****

			Mathematical Operators
			+ - / * %

			Logical Operators
			[boolean] && [boolean]
			[boolean] || [boolean]
			![boolean]


			Comparsion Operators
			[ number ] == [ number ]
			[ number ] <= [ number ]
			[ number ] >= [ number ]
			[ number ] != [ number ]
			[ number ] <  [ number ]
			[ number ] >  [ number ]
		*/
		// mathematical operators
		int boys = 17;
		int girls = 14;
		double earned = 12.76;
		double spent = 5.5;
		int ssn = 756483923;

		int students = boys + girls;
		double moneyLeft = earned - spent;
		int lastFourDigOfSSN  = ssn % 10000;
		double earnedInFiveWeeks = earned * 5;
		double groupsOfFour = students / 4;

		//logical operators
		boolean sick = true;
		boolean weekday = true;
		boolean ventraCard = true;
		boolean car = false;

		boolean goToSchool = weekday && !sick;
		boolean goOut= ventraCard || car;

		//comparison operators
		int age = 12;
		int drivingAge = 18;
		int testGrade=67;
		int siblings=3;

		boolean canDrive = age > drivingAge;
		boolean grounded = testGrade =< 70;
		boolean isOnlyChild= siblings == 0;

		/**** If-Conditions  ****
			Rules:
				* If-conditions always start with: if
				* If-conditions optionally can have numerous: else if
				* If-conditions may end with: else

			Structure:
		––––––––––––––––––––––––––––––––––––––––
			if ( [boolean] ) {
				[code];
			}
		––––––––––––––––––––––––––––––––––––––––
			if ( [boolean] ) {
				[code];
			}
			else {
				[code];
			}
		––––––––––––––––––––––––––––––––––––––––
			if ( [boolean] ) {
				[code];
			}
			else if ( [boolean] ) {
				[code];
			}
			else if ( [boolean] ) {
				[code];
			}
			...
		––––––––––––––––––––––––––––––––––––––––
			if ( [boolean] ) {
				[code];
			}
			else if ( [boolean] ) {
				[code];
			}
			else if ( [boolean] ) {
				[code];
			}
			...
			else {
				[code];
			}
		––––––––––––––––––––––––––––––––––––––––
		*/
	}
}