Lesson 14 - Activity 1

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1 13 Lesson 14 - Activity 1 / Term 1: Lesson 14 Coding Activity 1 Test if an integer is not between 5 and 76 inclusive. Sample Run 1 Enter a number: 7 False Sample Run 2 Enter a number: 1 True / class Lesson_14_Activity_One //Declare a scanner and input an int. Scanner scan = new Scanner(System.in); System.out.println("Please enter an integer:"); int n = scan.nextint(); //If n is not in the range, print True. if (!( n >= 5 && n <= 76)) System.out.println("True"); //Otherwise, print False. else System.out.println("False"); APCS Unit 2 Activity Guide Version 1.0 Edhesive

2 14 Lesson 14 - Activity 2 / Term 1: Lesson 14 Coding Activity 2 Write a program to input two integers and print "Both are positive or zero." to the screen, if both are positive or zero. Print "One or both are negative." otherwise. / class Lesson_14_Activity_Two //Declare a Scanner and input two integers. Scanner scan = new Scanner(System.in); System.out.println("Please enter two integers:"); int x = scan.nextint(); int y = scan.nextint(); //Use if-else to produce the necessary output. if(x >= 0 && y >= 0) System.out.println("Both are positive or zero."); else System.out.println("One or both are negative."); APCS Unit 2 Activity Guide Version 1.0 Edhesive

3 15 Lesson 14 - Activity 3 / Term 1: Lesson 14 Coding Activity 3 The Internet runs on web addresses.the addresses we type represent the IP address for each site and how the computer finds an individual web page. IP addresses are made up of four numbers, each between 0 and 255 separated by a period. For example, is an IP address. Write a program to enter four numbers and test if they make up a valid IP address. In other words, test to see if the numbers entered are between 0 and 255 inclusive. Sample Run 1 Please enter the first octet: 898 Please enter the second octet: 34 Please enter the third octet: 712 Please enter the fourth octet: 45 Octet 1 is incorrect Octet 3 is incorrect Sample Run 2 Please enter the first octet: 112 Please enter the second octet: 200 Please enter the third octet: 0 Please enter the fourth octet: 254 IP Address: / class Lesson_14_Activity_Three //Declare a Scanner and input four octets. Scanner scan = new Scanner(System.in); APCS Unit 2 Activity Guide Version 1.0 Edhesive

4 16 System.out.println("Please enter the first octet: "); int o1 = scan.nextint(); System.out.println("Please enter the second octet: "); int o2 = scan.nextint(); System.out.println("Please enter the third octet: "); int o3 = scan.nextint(); System.out.println("Please enter the fourth octet: "); int o4 = scan.nextint(); //Set up a flag variable for correct input. int correct = 1; //Check octet 1. if (!(o1 >= 0 && o1 <= 255)) System.out.println("Octet 1 is incorrect"); correct = 0; //Check octet 2. if (!(o2 >= 0 && o2 <= 255)) System.out.println("Octet 2 is incorrect"); correct = 0; //Check octet 3. if (!(o3 >= 0 && o3 <= 255)) System.out.println("Octet 3 is incorrect"); correct = 0; // Check octet 4. if (!(o4 >= 0 && o4 <= 255)) System.out.println("Octet 4 is incorrect"); correct = 0; //Check the flag for a correct IP address. if (correct == 1) System.out.println("IP Address: " + o1 + "." + o2 + "." + o3 + "." + o4); APCS Unit 2 Activity Guide Version 1.0 Edhesive

5 17 Lesson 17 - Activity 1 / Term 1: Lesson 17 Coding Activity 1 Write a program that will input a list of test scores in from the keyboard. When the user enters -1, print the average. What do you need to be careful about when using -1 to stop a loop? Sample Run: Enter the Scores: The average is: 72.5 / class Lesson_17_Activity_One //Declare a Scanner and prompt for scores. Scanner scan = new Scanner(System.in); System.out.println("Enter the Scores: "); //Input the first score and declare sum and count variables. int test = scan.nextint(); int sum = 0; int c = 0; //While the input is not -1, increase the count, //add to the sum, and read the next input. while (test!= -1) sum += test; c++; test = scan.nextint(); //Calculate and print the average. System.out.println("The average is: " + 1.0sum/c); APCS Unit 2 Activity Guide Version 1.0 Edhesive

6 18 Lesson 17 - Activity 2 / Term 1: Lesson 17 Coding Activity 2 Ask the user for two numbers. Print only the even numbers between them, you should also print the two numbers if they are even. Sample Run 1: Enter two numbers: Sample Run 2: Enter two numbers: / class Lesson_17_Activity_Two //Declare a Scanner and input two numbers. System.out.println("Enter two numbers: "); Scanner scan = new Scanner(System.in); int a = scan.nextint(); int b = scan.nextint(); //Create a new variable, start, which is a rounded //up to the nearest even number. int start = a + (a%2); //While start is in range, print it and increase by 2. while (start <= b) System.out.print(start + " "); start += 2; APCS Unit 2 Activity Guide Version 1.0 Edhesive

7 19 Lesson 20 - Activity 1 / Term 1: Lesson 20 Coding Activity Computer science jobs are in demand. Right now we have a shortage of people that can do computer programming, and one of the fastest growing areas of new jobs in the sector are so-called hybrid jobs. This means you specialize in an area like biology, and then use computer programming to do your job. These hybrid jobs exist in the arts, sciences, economics, healthcare, and entertainment fields. One of these jobs is computational biology. Computational Biology, sometimes referred to as bioinformatics, is the science of using biological data to develop algorithms and relations among various biological systems. In this lab we are going to investigate the data from a grey seal named Gracie. We ll input the longitude and latitude data from a tracking device. We want to investigate the farthest north, south, east and west Gracie has been. We will use the latitude to measure this. Write a program to enter Gracie s longitude and Latitude data. Each time through the loop it should ask if you want to continue. Enter 1 to repeat, 0 to stop. Any value for latitude not between -90 and 90 inclusive should be ignored. Any value for longitude not between -180 and 180 inclusive should be ignored. Sample Run: Please enter the latitude: Please enter the longitude: Would you like to enter another location? 1 Please enter the latitude: Please enter the longitude: Would you like to enter another location? 1 Please enter the latitude: Please enter the longitude: APCS Unit 2 Activity Guide Version 1.0 Edhesive

8 20 Would you like to enter another location? 1 Please enter the latitude: 300 Please enter the longitude: Incorrect Latitude or Longitude Please enter the latitude: Please enter the longitude: Would you like to enter another location? 0 Farthest North: Farthest South: Farthest East: Farthest West: / class Lesson_20_Activity //Declare a Scanner. Scanner scan = new Scanner(System.in); //Set a flag variable, rep, to control the loop. int rep = 1; //Set up temporary variables to store the current location. double lo = 0; double la = 0; //Set up a max and min for latitude and longitude. double maxlat = -90; double minlat = 90; double maxlon = -180; double minlon = 180; APCS Unit 2 Activity Guide Version 1.0 Edhesive

9 21 //While rep == 1, continue the loop. while (rep == 1) //Input a lat and long value. System.out.println("Please enter the latitude: "); la = scan.nextdouble(); System.out.println("Please enter the longitude: "); lo = scan.nextdouble(); //If the values are invalid, print an error, //and continue the loop. if (!(la >= -90 && la <= 90)!(lo >= -180 && lo <= 180)) System.out.println( "Incorrect Latitude or Longitude"); //Otherwise, check for a new max or min and ask the //user if they would like to continue. else if(la > maxlat) maxlat = la; if(la < minlat) minlat = la; if(lo > maxlon) maxlon = lo; if(lo < minlon) minlon = lo; //while System.out.println( "Would you like to enter another location? "); rep = scan.nextint(); //Print the results. System.out.println("Farthest North: " + maxlat); System.out.println("Farthest South: " + minlat); System.out.println("Farthest East: " + maxlon); System.out.println("Farthest West: " + minlon); APCS Unit 2 Activity Guide Version 1.0 Edhesive

10 1 Lesson 22 - Activity 1 / Term 1: Lesson 22 Coding Activity 1 Write the code to take a String and print it with one letter per line. Sample run: Enter a string: bought b o u g h t / class Lesson_22_Activity_One //Declare a Scanner and input a String. Scanner scan = new Scanner(System.in); System.out.println("Enter a string:"); String h = scan.nextline(); //Loop through the String, printing each character. int i = 0; while (i < h.length()) System.out.println(h.charAt(i)); i++; APCS Unit 3 Activity Guide Version 1.0 Edhesive

11 2 Lesson 22 - Activity 2 / Term 1: Lesson 22 Coding Activity 2 Write the code to take a String and print it diagonally. Sample run: Enter a string: bought b o u g h t Use a tab character for every four spaces in the sample. Hint: You may need more than one loop. / class Lesson_22_Activity_Two //Declare a Scanner and input a String. Scanner scan = new Scanner(System.in); System.out.println("Enter a string:"); String h = scan.nextline(); //For each character, use a loop to print tabs //so that the ith character is preceded by //i tabs. int i = 0; while (i < h.length()) int j = 0; while(j < i) System.out.print("\t"); j++; System.out.println(h.charAt(i)); i++; APCS Unit 3 Activity Guide Version 1.0 Edhesive

12 3 Lesson 24 - Activity 1 / Term 1: Lesson 24 Coding Activity 1 Use a for loop to print all of the numbers from 23 to 89, with 10 numbers on each line. Print one space between each number. / class Lesson_24_Activity_One //Loop from 23 to 89. for (int i = 23; i <= 89; i++) //Print each number followed by a space. System.out.print(i + " "); //Use % to print a new line every 10 numbers. if( i % 10 == 2) System.out.println(); Lesson 24 - Activity 2 / Term 1: Lesson 24 Coding Activity 2 Use a for loop to print the even numbers between 1 and 50. Print each number on a new line. / class Lesson_24_Activity_Two //Loop through the numbers from 1 to 50. for (int i = 1; i <= 50; i++) //If a number is even, print it. if (i%2 == 0) System.out.println(i); APCS Unit 3 Activity Guide Version 1.0 Edhesive

13 4 Lesson 24 - Activity 3 / Term 1: Lesson 24 Coding Activity 3 Input an int between 0 and 100 and print the numbers between it and 100. If the number is not between 0 and 100 print "error". Print 20 numbers per line. Sample Run 1: Enter a number between 0 and 100: Sample Run 2: Enter a number between 0 and 100: 105 error / class Lesson_24_Activity_Three //Declare a Scanner and input a number. Scanner scan = new Scanner(System.in); System.out.println("Enter a number between 0 and 100"); int x = scan.nextint(); //If x is out of range, print error. if( x < 0 x > 100) System.out.println("error"); //Otherwise, use a for loop to print every number from x to 100. //Use modular division to print 20 numbers per line. else for(int i = x; i <= 100; i++) System.out.print(i + " "); if(i%20 == 0) System.out.println(); APCS Unit 3 Activity Guide Version 1.0 Edhesive

14 5 Lesson 29 - Activity 1 / Term 1: Lesson 29 Coding Activity 1 A student wants an algorithm to find the hardest spelling word in a list of vocabulary. They define hardest by the longest word. Write the code to find the longest word stored in an array of Strings called list. If several words have the same length it should print the first word in list with the longest length. For example, if the following list were declared: String list [] = "high", "every", "nearing", "checking", "food ", "stand", "value", "best", "energy", "add", "grand", "notation", "abducted", "food ", "stand"; It would print: checking / class Lesson_29_Activity_One / Fill this list with values that will be useful for you to test. A good idea may be to copy/paste the list in the example above. Do not make any changes to this list in your main method. You can print values from list, but do not add or remove values to this variable. / public static String [] list = "This","is","a","test","list"; //Declare a variable to store the location of the longest String. int longest = 0; //Loop through the list, searching for a String longer than //longest. for(int i = 0; i < list.length; i++) if(list[i].length() > list[longest].length()) longest = i; //Print the longest value in the list. System.out.println(list[longest]); APCS Unit 3 Activity Guide Version 1.0 Edhesive

15 6 Lesson 29 - Activity 2 / Term 1: Lesson 29 Coding Activity 2 Write a loop that processes an array of strings. Each String should be printed backwards on its own line. For example, if the list contains: "every", "nearing", "checking", "food", "stand", "value" It should output: yreve gniraen gnikcehc doof dnats eulav / class Lesson_29_Activity_Two / Fill this list with values that will be useful for you to test. A good idea may be to copy/paste the list in the example above. Do not make any changes to this list in your main method. You can print values from list, but do not add or remove values to this variable. / public static String [] list = "siht","si","a","tset","tsil"; //Use a for loop to access each String in the list. for(int i = 0; i < list.length; i++) //Loop through each String backwards, printing the //characters. for(int j = list[i].length() - 1; j >= 0; j--) System.out.print(list[i].charAt(j)); //print a new line after each String. System.out.println(); APCS Unit 3 Activity Guide Version 1.0 Edhesive

16 7 Lesson 30 - Activity 1 / Term 1: Lesson 30 Coding Activity Due to a problem with a scanner an array of words was created with spaces in incorrect places. Write the code to process the list of words and trim any spaces out of the words. So if the list contains: "every", " near ing ", " checking", "food ", "stand", "value " It should be changed to hold: "every", "nearing", "checking", "food", "stand", "value" Note that this activity does not require you to print anything. Your code should end with the array list still declared and containing the resulting words. / class Lesson_30_Activity / Your code should end with the following array modified as the instructions above specify. You may modify the elements in this list but make sure you do not add or remove anything from it. / public static String [] list = "Th is"," is","a ","t es t","li st"; //Loop through the list to access each String. for(int i = 0; i < list.length; i++) //Declare a new String to include only the non-space //characters. String tmp = ""; //For each character in the current String, if it is not //a space, add it to the temporary String, tmp. for(int j = 0; j < list[i].length(); j++) if( list[i].charat(j)!= ' ') tmp += list[i].charat(j); //Set the current String to the value of tmp. list[i] = tmp; APCS Unit 3 Activity Guide Version 1.0 Edhesive

17 8 Lesson Activity 1 / Term 1: Lesson 1011 Coding Activity Input a String to represent the octal number and translate to the base ten number. The octal number must be 8 digits or less. Your program should also check that all the digits are 0-7, then translate the number to base ten. Sample Run 1: Enter a number in base 8: 1287 ERROR: Incorrect Octal Format Sample Run 2: Enter a number in base 8: Sample Run 3: Enter a number in base 8: ERROR: Incorrect Octal Format / class Lesson_1011_Activity public static void main (String str[]) //Set up a Scanner and input a base 8 number as a String. Scanner scan = new Scanner (System.in); System.out.println("Enter a number in base 8: "); String oct1 = scan.nextline(); //Use a loop to check for valid input. for (int i = 0; i < oct1.length(); ++i) //Check for invalid ith character. if(i >= 8!(oct1.charAt(i) >= '0' && oct1.charat(i) <= '7')) //Print an error and return. System.out.println("ERROR: Incorrect Octal Format"); return; APCS Unit 3 Activity Guide Version 1.0 Edhesive

18 9 //Declare an int to store the value of our base 8 number. int a = 0; //Get the highest power of 8 int highestpower = oct1.length()-1; //use a loop to sum the value of each digit, multiplied //by 8 to the power of that digit. for (int i = 0; i < oct1.length(); ++i) a += ((oct1.charat(i)) - 48) Math.pow(8, highestpower-i); //Print the result. System.out.println(a); APCS Unit 3 Activity Guide Version 1.0 Edhesive

Lesson 14 - Activity 1

13 Lesson 14 - Activity 1 / Term 1: Lesson 14 Coding Activity 1 Test if an integer is not between 5 and 76 inclusive. Sample Run 1 Enter a number: 7 False Sample Run 2 Enter a number: 1 True / class Lesson_14_Activity_One