4.15. FRQ Style Coding Practice¶

In the following exercises which are similar to the Free Response Questions (FRQs) in the AP exam, you will write code inside a method with parameters and return values. Make sure that you use the parameter variables given in the method header and return a value.

public static return-type method-name(param-type param-var1, param-type param-var2, ...)
{
    // ADD CODE HERE using the param-variables //
    return result;
}

Create the method front_back(str, start, end) that takes three strings and returns a string based on the following conditions.

If str contains start at the beginning and end at the end then return "s_e".
If str contains start at the beginning of the string return "s".
if str contains end at the end of the string return "e".
Otherwise return "n".

Example Input	Expected Output
`front_back("Open at noon", "Open", "noon")`	`"s_e"`
`front_back("Opening time", "Open", "noon")`	`"s"`
`front_back("Afternoon", "Open", "noon")`	`"e"`
`front_back("Closed", "Open", "noon")`	`"n"`
`front_back("It is noon now", "open", "noon")`	`"n"`

public class FrontBack
{
   public static String front_back(String str, String start, String end)
   {
       // ADD CODE HERE //
   }

public static void main(String[] args)
   {
      String str1 = "Opening time";
      String start1 = "Open";
      String end1 = "noon";
      System.out.println(front_back(str1, start1, end1));

String str2 = "Afternoon";
      String start2 = "Open";
      String end2 = "noon";
      System.out.println(front_back(str2, start2, end2));

String str3 = "Open at noon";
      String start3 = "Open";
      String end3 = "noon";
      System.out.println(front_back(str3, start3, end3));
  }
}

====
import static org.junit.Assert.*;
import org.junit.Test;
import java.io.IOException;
import java.util.Arrays;

public class RunestoneTests extends CodeTestHelper {
    public RunestoneTests() {
        super();
    }

@Test
    public void testBoundarySum() throws IOException {
         String output = getMethodOutput("main");
         String expect = "s\ne\ns_e\n";
        boolean passed = getResults(expect, output, "Expected output from main");
        assertTrue(passed);
   }
}

The squirrels in Palo Alto spend most of the day playing. In particular, they play if the temperature is between 60 and 90 (inclusive). Unless it is summer, then the upper limit is 100 instead of 90. Given an int temperature and a boolean isSummer, return true if the squirrels play and false otherwise.

Example Input	Expected Output
`squirrelPlay(70, false)`	`true`
`squirrelPlay(95, false)`	`false`
`squirrelPlay(95, true)`	`true`

Given a day of the week encoded as 0=Sun, 1=Mon, 2=Tue, …6=Sat, and a boolean indicating if we are on vacation, return a string of the form "7:00" indicating when the alarm clock should ring. Weekdays, the alarm should be "7:00" and on the weekend it should be "10:00". Unless we are on vacation – then on weekdays it should be "10:00" and weekends it should be "off".

Example Input	Expected Output
`alarmClock(1, false)`	`7:00`
`alarmClock(5, false)`	`7:00`
`alarmClock(0, false)`	`10:00`

You and your date are trying to get a table at a restaurant. The parameter you is the stylishness of your clothes, in the range 0..10, and date is the stylishness of your date’s clothes. The result getting the table is encoded as an int value with 0=no, 1=maybe, 2=yes. If either of you is very stylish, 8 or more, then the result is 2 (yes). With the exception that if either of you has style of 2 or less, then the result is 0 (no). Otherwise the result is 1 (maybe).

Example Input	Expected Output
`dateFashion(5, 10)`	`2`
`dateFashion(8, 2)`	`0`
`dateFashion(5, 5)`	`1`

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4.15. FRQ Style Coding Practice¶