Week 3: Minutes (Monday)

Minutes:

- Variables & types

- Value assignment to variables

- Printing values of variable out

- Operators and their order

- Compositions of operators

- Compositions with printing command

- A lot of examples demonstrated

Code:

public class w3c2 {

public static void main(String[] args) {

//******* Declaration of Variables****//

String val;

int num;

int n1,n2,add,sub,mul,div;

double pwr;

//int double;

double weight;

//********* Variables & Assignment ****//

System.out.print(val);

System.out.print(", number:");

System.out.print(num);

System.out.print(", weighted:");

System.out.print(weight);

//********* Operatiors ****//

n1=8;

n2=2;

add = n1+n2;

sub = n1-n2;

mul = n1*n2;

div = n1/n2;

pwr = Math.pow(n1,n2);

System.out.println("Again, power = " + pwr);

System.out.println("Again, multiplication = " + (n1+n2));

System.out.println("All in order ADD,SUB,MUL,DIV,PWR:" + add + ", " + sub + ", " + mul + ", "+ div + ", " + pwr);

System.out.println("All in order ADD,SUB,MUL,DIV,PWR:" +(n1+n2)+ ", " + (n1-n2) + ", " + n1*n2 + ", "+ n2/n2 + ", " + (Math.pow(n1,n2)));

// Remove parenthesis of all operators

//******* Operators for Strings*******//

/*

String st,st1, st2;

st1 = "We are ";

st2 = "UBD students";

st = st1 + st2;

System.out.println(st1);

System.out.println(st2);

System.out.println(st);

*/

//num = squared(6);

// System.out.println("Value:" + squared(81));

//System.out.println("Value:" + Math.sqrt(5));

//squared(3);

//num = Math.sqrt(5);

//num = squared(5);

//System.out.println("The value" + num);

}

Hints: to make a program to solve a problem, you should think in the top-down analysis:

- what problem do I want to solve?

- how many variable do I need for this problem?

- choose types for the variables

- declare the variables

- use operators with special attention of their order (usually using Parenthesis to make the statement more clear)

- assign simple values for the test

- test and evaluate