1.0, 0.5, 0.25, 0.125, 0.0625, 0.03125, 0.015625, 0.0078125

n = 10
**********     
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *

n = 4
****       
 ***
  **
   *

n = 12
************     
 ***********
  **********
   *********
    ********
     *******
      ******
       *****
        ****
         ***
          **
           *

n = 1     
*

public class Tri {
   public static void chars(char ch, int n) {
      for (int i = 1; i <= n; i++)
         System.out.print(ch);
   }
   
   public static void main(String[] args) {
      int n = 1;
      // insert your answer below
      
      
      
      
      
      
      
      
      
      
   }
}

// first seven prime numbers
public int[] nums = {2, 3, 5, 7, 11, 13, 17};

Write a simple code segment (with a loop) that will add up the square of each array entry. When you are done, print your answer. Thus your program should calculate 2² + 3² + 5² + 7² + 11² + 13² + 17², and it should do this by accessing the array elements. (Your program should not directly use the number 7, the number of elements in the array, but should work unchanged if one added 19 to the end of the above array.)

// Temp: temperature conversion table
public class Temp {

   // ftoc: insert function definition here

   
   

   

   public static void main(String[] args) {

      for (double f = -40; f <= 220; f = f + 20) {
         double c = ftoc(f);
         if (f == 0) System.out.print("  ");
         else if (f > 0 && f < 100) System.out.print(" ");
         System.out.println(f + "   " + c);
      }

   }
}

/* Output:
-40.0   -40.0
-20.0   -28.88888888888889
  0.0   -17.77777777777778
 20.0   -6.666666666666667
 40.0   4.444444444444445
 60.0   15.555555555555557
 80.0   26.666666666666668
100.0   37.77777777777778
120.0   48.88888888888889
140.0   60.0
160.0   71.11111111111111
180.0   82.22222222222223
200.0   93.33333333333334
220.0   104.44444444444444
*/

1. In the program above, give in the definition for a function ftoc that will convert Fahrenheit temperature to Centigrade and will work properly with the rest of the code. The formula is c = (5/9)(f - 32).

2. What is the purpose of the following two lines in the program? Give the answer below them.

   
    if (f == 0) System.out.print("  ");
    else if (f > 0 && f < 100) System.out.print(" ");
            
            
   
   

// Student.java: a simple class holding information about a student
public class Student {
   private String name; // In the form "LastName, FirstName"
   private double gpa; // grade point average
   private int collegeClass; // 1 = FR, 2 = SO, 3 = JR, 4 = SR, 5 = GR

   public Student(                                      ){
   
   
   
   

   }

   public double getGPA() {
   
   
   
   }
   
   public String toString() {
   
   



   }
}



// Students.java: test the Student class
public class Students {
   public static void main (String[] args) {
   
   
   
   





   
   
   


   }
}

1. Write code above for the constructor that has three parameters corresponding to the three data fields.
2. Write code above for the getGPA method that will return the value of gpa.
3. Write code above for the toString method that will return a String with the three data fields in it.
4. Below, say what use a toString method might be put to. (What is it for?)

5. Write code inside the main function of the separate Students class that will create Student classes with the following data for name, GPA, and collegeClass:
   • "Blow, Joe",     3.4, 2
   • "Bonkers, Bruce", 2.9, 3
   • "Nutcase, Nancy", 3.7, 2
6. Write code inside the main function of the separate Students class that will invoke the getGPA method for the first student above (Joe Blow).

Write a function (method) toEnglish that will convert its int input parameter (in the range from 0 to 99 inclusive) to English. [Hints: You must use the arrays of Strings given below. First handle an input parameter value n < 20 with the teens array. Remember, if the input parameter is n = 47 then n/10 will equal 4 and you can use the tens array. Similarly n%10 will equal 7 and you can use the ones array. Then concatenate.]

   String[] ones =
      {"zero", "one", "two",   "three", "four",
       "five", "six", "seven", "eight", "nine"};
   String[] teens =
     {"Zero",    "One",     "Two",       "Three",    "Four",
      "Five",    "Six",     "Seven",     "Eight",    "Nine",
      "Ten",     "Eleven",  "Twelve",    "Thirteen", "Fourteen",
      "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
   String[] tens =
     {"",      "Ten",   "Twenty",  "Thirty", "Forty",
      "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};

   public String toEnglish(int n) {
      // convert n, 0 <= n <= 99, to an English string and return it
      // Fill in code below.
      
      










      
      
      
      
   }