CSC111

CSC111 Quick Revision

Problem

We want to develop a Java program to calculate the price of a product imported from the United States and to be sold in the Saudi market. The price of the product is calculated as follows

Price (R.S) = original price(R.S) + shipping cost +10% of original price

Original price (R.S) = Original Price ($ )* 3.75

Your program should ask the user to enter the product in the following form

ProductName_xx.xx$

Analysis

Input ProductName_xx.xx$

processing Extract the product name from input Extract the price from input calculate original price in RS Original price (R.S) = Original Price

($ )* 3.75 Price (R.S) = original price(R.S) + shipping cost +10% of original

price

Output Prductname_xx.xxR.S

Design1. Start the program

2. Read product info and save in variable productInfo

3. Extract product name and save in variable name?

4. Extract product price and save in variable originalPrice$?

5. originalPriceRS = originalPrice$ * 3.75

6. Read shipping cost and save in variable shippingCostRS

7. proudctPriceRS= originalPriceRS+ shippingCost+10/100 *originalPriceRS.

8. print the proudctPriceRS.

9. End the Program

Coding

Start the program

/*We want to develop a Java program to calculate the price of a product imported from the United States and to be sold in the Saudi market. The price of the product is calculated as follows Price (R.S) = original price(R.S) + shipping cost +10% of original price(R.S) Original price (R.S) = Original Price($)* 3.75*///hessh arraqibah//19/Feb/2013

// import Section – import used java libraries public class Converter{ // main method public static void main( String args[] ){ // Declaration section – Declare needed variables // Input section – Enter required data // Processing section – Processing Statements // Output section – Display expected results } // end main } // end class

1. Start by writing the program structure

Variable Declaration What variable do I need ??

input productPrice // in $ shippingCost // in RS

Processing originalPrice //in $ price //in RS name productPriceRS

Variable Declaration

what about data type

input ProductInfo shippingCost

Processing originalPrice price name proudctPriceRS

input ProductInfo String shippingCost Double // in RS

Processing originalPrice Double //price in $ price Double // price in RS name String proudctPriceRS double

any constant ??

// import Section – import used java libraries public class Converter{ // main method public static void main( String args[] ){ // Declaration section – Declare needed variables String productInfo; String name; double shippingCost, price, originalPrice, proudctPriceRS;

// Input section – Enter required data // Processing section – Processing Statements

// Output section – Display expected results } // end main } // end class

2. Declare variable Note:

• if some variable has initial value initialize them

• Use appropriate variable name

3.Input

Reading input from the user• 4 basic steps

Step 1: import the Scanner class: import java.util.Scanner;

Step 2 : declaring a reference variable of a Scanner Scanner input ; //we named the object read

Step 3: creating an instance of the Scanner input = new Scanner (System.in);

Step 4: use specific methods to enter data int x = input.nextInt();

input=new Scanner (System.in); //read proudct name & price in form prudctname_price$ System.out.println("Enter the product information"); productInfo=input.next(); //read shipping cost from the user System.out.println("Enter the shipping cost"); shippingCost=input.nextDouble();// Processing section – Processing Statements }

}

/// import Section – import used java libraries import java.util.Scanner;public class Converter{ // main method public static void main( String args[] ){ // Declaration section – Declare needed variables String productInfo;//to store user input String name; //to store the product name double shippingCost,price,originalPrice,proudctPriceRS;

Scanner input;

• Each input required separate read statement

• Print message before each read

4.Processing

1. Extract product name and save in variable name?

2. Extract product price and save in variable price?

The input format is

ProductName_xx.xx$

name=ProductName price =xx.xx

4.Processing

1. Extract product name and save in variable name?

2. Extract product price and save in variable price? Find the position of ‘_’?

int p= productInfo.indexOf(‘_’); extract the product name from input

name =productInfo.substring(0,p); extract the price from input

price= productInfo.substring(p+1, productInfo.length-1);

price=Double.parseDouble(productInfo.substring(p+1, productInfo.length-1));

4.Processing

3. originalPrice = price * 3.75

4. Read shipping cost and save in variable shippingCost

5. productPriceRS= originalPrice+ shippingCost+10/100 *originalPrice.

Enter the product informationpen_45.70$Enter the shipping cost3The product information in Saudi Riyals pen_191.5125 RS

Sample Run

//import Section – import used java libraries import java.util.Scanner;public class Converter{ // main method public static void main( String args[] ){ // Declaration section – Declare needed variables String productInfo;//to store user input String name; //to store the product name double shippingCost,price,originalPrice,proudctPriceRS;

Scanner input;

input=new Scanner (System.in); //read proudct name & price in form prudctname_price$ System.out.println("Enter the product information"); productInfo=input.next(); //read shipping cost from the user

System.out.println("Enter the shipping cost"); shippingCost=input.nextDouble(); // Processing section – Processing Statements //extract product name & price from product_inf int p=productInfo.indexOf('_'); name= productInfo.substring(0,p); int l=productInfo.length(); price=Double.parseDouble(productInfo.substring(p+1,l-1)); //calculate the original price originalPrice=price*3.75; //calculate proudct price productPriceRS=originalPrice+shippingCost+0.10*originalPrice; // Output section – Display expected results } // end main } // end class

//import Section – import used java libraries import java.util.Scanner;public class Converter{ // main method public static void main( String args[] ){ // Declaration section – Declare needed variables String productInfo;//to store user input String name; //to store the product name double shippingCost,price,originalPrice,proudctPriceRS;Scanner input;

input=new Scanner (System.in);

//read proudct name & price in form prudctname_price$ System.out.println("Enter the product information"); product_info=input.next(); //read shipping cost from the user

System.out.println("Enter the shipping cost"); shippingCost=input.nextDouble(); // Processing section – Processing Statements //extract product name & price from product_inf int p=productInfo.indexOf('_'); name= productInfo.substring(0,p); int l=productInfo.length(); price=Double.parseDouble(productInfo.substring(p+1,l-1)); //calculate the original price originalPrice=price*3.75; //calculate proudct price proudctPriceRS=originalPrice+shippingCost+0.10*originalPrice; // Output section – Display expected results

System.out.println("The product information in Saudi Riyals"+name+"_"+proudctPriceRS+" RS"); } // end main } // end class

5. Display the result

Use better display format

System.out.printf("The product information in Saudi Riyals %s_%.2f RS”,name,productPriceRS);

Enter the product informationpen_45.70$Enter the shipping cost3The product information in Saudi Riyals pen_191.51 RS

Sample Run