Lab Assignment #1 :: CPTR 105 :: 2/27/ 09

1. Write a program that will first ask for two values:

   • the number of days worked in a week
   • the number of hours worked per day

   If any of the two values is negative, inform the user of this, and do nothing further. If however, the numbers are positive, then calculate and print out the amount of hours worked per month.

   Sample output if values are negative:

   You have entered a negative number

   Sample output if values are O.K.:

   You have worked 156 hours this month

2. Write a program that will ask the user to input a string. Store this string in a String variable and print out the following:

   • whether the input string contains the word "Hello" in it
   • if the last character of the string is a space character

   Sample output:

   The string you input does not have the word "Hello" in it.

   The string you input has a space at the end

Solutions

1. This code will calculate the total hours worked appropriately:

   Scanner keyboard = new Scanner(System.in);
   
   System.out.println("Please enter the number of days worked in a week");
   int daysWorked = keyboard.nextInt();
   
   System.out.println("Please enter the number of hours worked per day");
   int hoursWorked = keyboard.nextInt();
   
   if (daysWorked < 0 || hoursWorked < 0) {
       System.out.println("You entered a negative number. Good bye!");
   } else {
       int totalWorked = daysWorked * hoursWorked * 30; // assuming 30 days in a month
       System.out.println("Total hours worked in the month: " + totalWorked);
   }
   

2. This code will process the input string appropriately:

   System.out.println("Please enter a string");
   String inputString = keyboard.nextLine();
   
   int positionOfSubString = inputString.indexOf("hello");
   if (positionOfSubString != -1) {
       System.out.println("The string you entered has a \"hello\" in it ");
   } else {
       System.out.println("The string you entered doesn't have a \"hello\" in it ");
   }
   
   int lastCharPosition = inputString.length() - 1;
   char lastChar = inputString.charAt(lastCharPosition);
   if(lastChar == ' ') {
       System.out.println("The last character in your string is a space");
   } else {
       System.out.println("The last character in your string is not a space");
   }