Coding Practice 1a (1.1-1.6)

Activity 1.18.1.

The following code should print “Mary’s favorite color is blue”. However, the code has errors. Fix the code so that it compiles and runs correctly.

Activity 1.18.2.

The following code should print “Gabby’s favorite sport is soccer”. However, the code has errors. Fix the code so that it compiles and runs correctly.

Activity 1.18.3.

The following code should print Your name is Carly and your favorite color is red. Finish the code so that it prints the output correctly using the variables provided.

Activity 1.18.4.

Finish the code below so that it prints ``Your name is Justin and your age is 16`` using the variables provided.

Activity 1.18.5.

Write the code to print Julian's favorite color is green. His favorite food is pizza. using the variables provided.

Activity 1.18.6.

Finish the code below to print your favorite animal and food.

public class Test1
{
    public static void main(String[] args)
    {
        String animal =
        String food =
        System.out.println();

}
}
====
import static org.junit.Assert.*;

import org.junit.*;

import java.io.*;

public class RunestoneTests extends CodeTestHelper
{
    @Test
    public void testPrintStringsA() throws IOException
    {
        String target1 = "+animal";
        // boolean passed1 = checkCodeContains("print animal string",
        // target1);
        String code =
                getCodeWithoutComments()
                        .replaceAll(" ", "")
                        .replaceAll("\n", "");
        boolean passed1 = code.contains(target1);

getResults("" + true, "" + passed1, "Code prints animal variable");

assertTrue(passed1);
    }

@Test
    public void testPrintStringsB() throws IOException
    {
        String target1 = "+food";
        // boolean passed1 = checkCodeContains("print food string", target1);
        String code =
                getCodeWithoutComments()
                        .replaceAll(" ", "")
                        .replaceAll("\n", "");
        boolean passed1 = code.contains(target1);

getResults("" + true, "" + passed1, "Code prints food variable");
        assertTrue(passed1);
    }
}

Activity 1.18.7.

Finish the code below to print your favorite movie and book.

public class Test1
      {
          public static void main(String[] args)
          {
              String movie = "";
              String book = "";
              System.out.println();

}
      }
====
import static org.junit.Assert.*;

import org.junit.*;

import java.io.*;

public class RunestoneTests extends CodeTestHelper
{
    @Test
    public void testPrintStringsA() throws IOException
    {
        String target1 = "+movie";
        // boolean passed1 = checkCodeContains("print movie string", target1);
        String code =
                getCodeWithoutComments()
                        .replaceAll(" ", "")
                        .replaceAll("\n", "");
        boolean passed1 = code.contains(target1);

getResults("" + true, "" + passed1, "Code prints movie variable");
        assertTrue(passed1);
    }

@Test
    public void testPrintStringsB() throws IOException
    {
        String target1 = "+book";
        // boolean passed1 = checkCodeContains("print book string", target1);
        String code =
                getCodeWithoutComments()
                        .replaceAll(" ", "")
                        .replaceAll("\n", "");
        boolean passed1 = code.contains(target1);

getResults("" + true, "" + passed1, "Code prints book variable");
        assertTrue(passed1);
    }
}

Activity 1.18.8.

The following code should calculate the cost of a trip that is 300 miles if gas is $2.50 a gallon and your car gets 30 miles per gallon. However, the code has syntax errors, like missing semicolons, wrong case on names, or unmatched " or (. Fix the code so that it compiles and runs correctly.

Activity 1.18.9.

The following code should calculate the body mass index (BMI) for someone who is 5 feet tall and weighs 110 pounds. However, the code has syntax errors, like missing semicolons, wrong case on names, or unmatched " or (. Fix the code so that it compiles and runs correctly.

Activity 1.18.10.

The following code should calculate the number of miles that you can drive when you have $8.00 and the price of gas is 2.35 and the car gets 40 miles per gallon. However, the code has errors. Fix the code so that it compiles and runs correctly.

Activity 1.18.11.

The following code should calculate the cost of an item that is on clearance (70% off) when you also have a coupon for an additional 20% off the clearance price. However, the code has errors. Fix the code so that it compiles and runs correctly.

Activity 1.18.12.

The following code should calculate the number of whole days in 320893 seconds. However, the code has errors. Fix the code so that it compiles and runs correctly.

Activity 1.18.13.

Complete the code below to calculate and print how many months it will take to save $200 if you earn $20 a week.

Activity 1.18.14.

Write the code to calculate the number of miles you can drive if you have a 10 gallon gas tank and are down to a quarter of a tank of gas and your car gets 32 miles per gallon.

public class Test1
{
    public static void main(String[] args)
    {
        // Your code should declare the variables
        //  numGallons, milesPerGallon, and miles, and
        // calculate numGallons (the number of gallons left in the tank given the values above),
        // initialize milesPerGallon (the miles per gallon given above for this car),
        // calculate miles (the number of miles you can drive calculated from the other variables)
        // and print out miles.

}
}
====
import static org.junit.Assert.*;

import org.junit.*;

import java.io.*;

public class RunestoneTests extends CodeTestHelper
{
    @Test
    public void testMain() throws IOException
    {
        String output = getMethodOutput("main");
        String expect = "80.0\n";
        boolean passed =
                getResults(expect, output, "Expected output from main (use doubles!)");
        assertTrue(passed);
    }

@Test
    public void testFormulaMiles() throws IOException
    {
        String target1 = removeSpaces("numGallons * milesPerGallon");
        String target2 = removeSpaces("milesPerGallon * numGallons");

String code = removeSpaces(getCode());
        code = code.replaceAll("\$", "").replaceAll("\$", "");

boolean passed = code.contains(target1) || code.contains(target2);
        getResults(
                "true",
                "" + passed,
                "Formula for miles using the variables numGallons and milesPerGallon",
                passed);
        assertTrue(passed);
    }
}

Activity 1.18.15.

Write the code to calculate the number of seconds in 3 days. Remember that there are 60 seconds in a minute and 60 minutes in an hour and 24 hours in a day.

public class Test1
{
    public static void main(String[] args)
    {
        // Your code should declare the variables
        // secondsInDay and secondsInThreeDays and
        // initialize or calculate secondsInDay
        // and calculate secondsInThreeDays using secondsInDay
        // and print out secondsInThreeDays.

}
}
====
import static org.junit.Assert.*;

import org.junit.*;

import java.io.*;

public class RunestoneTests extends CodeTestHelper
{
    @Test
    public void testMain() throws IOException
    {
        String output = getMethodOutput("main");
        String expect = "259200\n";
        boolean passed =
                getResults(expect, output, "Expected output from main");
        assertTrue(passed);
    }

@Test
    public void testFormulaMiles() throws IOException
    {
        String target1 =
                removeSpaces("secondsInDay * 3;");
        String target2 =
                removeSpaces("3 * secondsInDay;");
        String code = removeSpaces(getCode());
        boolean passed1 = code.contains(target1);
        boolean passed2 = code.contains(target2);

boolean passed = passed1 || passed2;
        getResults(
                "true",
                "" + passed,
                "formula for secondsInThreeDays using the variable secondsInDay",
                passed);
        assertTrue(passed);
    }
}

Activity 1.18.16.

Write the code to print the number of chicken wings you can buy if you have $4.50 and they cost $0.75 each. Remember that you can’t buy part of a wing.

public class Test1
{
    public static void main(String[] args)
    {
        // Your code should use the variables
        // money, pricePerWing, numWings, and
        // initialize money and pricePerWing using the values above,
        // and calculate numWings using money and pricePerWing and type casting to int
        // and print out numWings

}
}
====
import static org.junit.Assert.*;

import org.junit.*;

import java.io.*;

public class RunestoneTests extends CodeTestHelper
{
    @Test
    public void testMain() throws IOException
    {
        String output = getMethodOutput("main");
        String expect = "6\n";
        boolean passed =
                getResults(expect, output, "Expected output from main");
        assertTrue(passed);
    }

@Test
    public void testFormulaWings() throws IOException
    {
        // codeContains will remove spaces
        String target = "numWings = (int)(money / pricePerWing)";
        boolean passed =
                checkCodeContains(
                        "formula for numWings using money and pricePerWing,"
                            + " and type casting to int with correct parentheses",
                        target);
        assertTrue(passed);
    }
}

Section 1.18 Coding Practice 1a (1.1-1.6)

Activity 1.18.1.

Activity 1.18.2.

Activity 1.18.3.

Activity 1.18.4.

Activity 1.18.5.

Activity 1.18.6.

Activity 1.18.7.

Activity 1.18.8.

Activity 1.18.9.

Activity 1.18.10.

Activity 1.18.11.

Activity 1.18.12.

Activity 1.18.13.

Activity 1.18.14.

Activity 1.18.15.

Activity 1.18.16.