Question

JAVA

Lab 9: Phone Call

Write a program that will calculate the cost of a phone call as follows:

1. The first 10 minutes are charged at a flat rate of $0.99 (Not 99 cents a minute - but 99 cents for the first 10 minutes or less).
2. This means that a phone call of 1 minute or 6 minutes or 10 minutes will be charged the same flat rate of 99 cents.
3. Every minute after the initial 10 minutes will be charged at $0.10 per minute.
4. Input the number of minutes talked as an integer.
5. Using an IF/ELSE structure, check for an entry of 0 minutes first, and inform the User that no minutes were entered.
   
   • IF 0 minutes are entered THEN
     • output an error message stating that no minutes were entered.
   • ELSE
     • Calculate and display the results.
     • The final display will show the minutes and the final cost.
     • The price will be formatted with 2 decimal places.
   • END IF

Include all Prologue information with your program

• Include an Initial Algorithm
• Include Input, Output, and Formulas (if any)
• Include a Refined Algorithm
• Test your program thoroughly with the following data:

1. 9 minutes
2. 10 minutes
3. 11 minutes
4. 35 minutes
5. 0 minutes

NOTE 1:

• DO NOT use the "return 0" code, end, break, or exit to force an exit from within your IF/ELSE structure.  Declare all variables within the data declaration section.
  • Let the program progress to the end of the main function.
  • The end of the main function is the only place that the “return 0” should be placed.
  • A switch statement is the only place that the break command should be placed.
• DO NOT use the continue statement.

NOTE 2:

1. Declare all variables within the data declaration section of each class and method.  (-.1)
2   Do not get input on the same line as a variable declaration.  (-.1)
3. Do not place an equation for computation on the same line as declaring a variable.  (-.1)
4. Do not place an equation for computation on the same line as an input statement.  (-.1)
5. Do not place any computations within an output statement. (-.1)

Answer 1

PFB PhoneCall java class source code.

Solution summary :

Program ask the user to enter call minutes and print the cost ($0.99/min for first 10 minutes , after that $0.10/min)
Displays error if , minutes entered is equal to or less than 0.

Finally it displays the call minutes and call cost.

Note : Program is tested for all asked test cases.

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PhoneCall.java
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import java.util.Scanner;

public class PhoneCall{

//driver method
public static void main(String[] args){

//Input the number of minutes talked as an integer.
int callTimeInMinutes;

//To store total call cost
double totalCallCost=0.0;
  
Scanner s = new Scanner(System.in);
  
System.out.print("Enter the call time in minutes : ");
callTimeInMinutes = s.nextInt();

//Checking if minutes entered is not less than or equal to 0.
//output an error message stating that no minutes were entered.
if(callTimeInMinutes<=0){
System.out.println("\nNo minutes were entered!");
}else{

//The first 10 minutes are charged at a flat rate of $0.99 or 99 cents
//Every minute after the initial 10 minutes will be charged at $0.10 per minute.
if(callTimeInMinutes>10){
totalCallCost=totalCallCost+(10*0.99) + ((callTimeInMinutes-10)*(0.10));
}else{
//calculate if minutes are less than or equal to 10
totalCallCost=totalCallCost+(callTimeInMinutes*0.99);
}
}

//Displaying call minutes ans call cost
System.out.println("\nCall minutes : " + callTimeInMinutes);

//The price will be formatted with 2 decimal places.
System.out.println("Call cost : " + String.format("%.2f", totalCallCost));

s.close();

}
}
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Output of asked inputs :
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Let me know, if any further help is required.