add week 1 code

rsha256 · rsha256 · commit 357d72fcf46c · 2018-10-24T02:12:05.000-04:00
diff --git a/Week1.java b/Week1.java
@@ -0,0 +1,82 @@
+public class Week1 { //declaration of class
+	public static void main(String[] args) { //Main Method: Operates code
+		
+	//SYNTAX
+		
+	    //Declaring Variables
+		double test = 4.0;
+		//type name = value;
+		final double pi = 3.14;
+		//final signifies that you cannot change it later in the code
+			
+		//Printing 	
+		System.out.print("Hello");
+		//Prints Hello
+		System.out.println("Hello");//(More useful)
+		//Prints Hello and then creates a new line beneath it
+		System.out.println(1);
+		//number values do not have to be in quotations.
+		
+	//VARIABLE TYPES
+		
+		//Double variables: Can hold large decimal values
+		double alpha = 1.0; 
+		double beta = 2.0;
+		System.out.println(alpha + beta);// would output 3.0
+		
+		//Integer Variables: can hold integer values
+		int alpha2 = 1;
+		int beta2 = 2;
+		System.out.println(alpha2 + beta2);// would output 3
+		
+		//String Variable: Can hold multiple characters
+		String delta = "Hello";
+		System.out.println(delta);//would output Hello
+		
+		//Char Variable: Can hold one character
+		char letter = 'a';
+
+	//OPERATORS
+		
+		double a = beta + alpha;//Addition: a = 3.0
+		double b = beta - alpha;//Subtraction: b = 1.0
+		double c = beta * alpha;//Multiplication: c = 2.0
+		double d = alpha/beta;//Division: d = 0.5
+		double f = beta%alpha;//Modulus:(provides remainder) f = 0.0
+		double g = alpha++;//Increment:(adds 1) g = 2.0;
+		double h = alpha--;//Decrement:(subtracts 1) h = 0.0;
+		
+	//CASTING
+		
+		double decimal= 1.71;
+	  //int integer = casting; 
+	  //will not work because integers cannot hold decimal values.  
+	  //Instead you should cast the double as an int.
+		int integer =(int) decimal; 
+		// changes the double value into an int by cutting off decimals NOT ROUNDING
+	  
+		
+		double fraction = 1/2;//fraction will = 0.0
+		//while 1/2 = 0.5 in real life, when two ints are divided in java, the result is also an int. 
+		//This means the resulting 0.5 would be shortened to 0
+		
+		//to fix this either the numerator or denominator must be made a double
+		fraction = 1.0/2;
+		//or the number must be cast as a double
+		fraction = (double) 1/2;//fraction = 0.5
+		
+		//Extra notes
+		
+		/* typing // creates a comment that does not change the code
+		 * words like double, int, and String are key words that cannot to be used as variable names
+		 * the = sign sets a value to the variable, it does not signify that the values are equal
+		 * while doubles cannot go into ints, ints can always go into doubles
+		 * (ie. double a = 1 works, but int a = 1.2 does not)
+		 * there are many more variable types, but most are not useful for beginners right now		
+		 */
+		
+		//If you have any questions feel free to ask any of the teachers on classroom. 
+		//We would be more than happy to help.
+
+	}
+}
