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Unbounded iteration End-of-topic questions 4 1. For each of the following problem statements: a. identify the input, output and processing steps. b. write the algorithm. Write an algorithm to read three numbers and find their product. Write an algorithm that displays the area of a rectangle by accepting length and width from the user. 3. Write an algorithm that will read the radius of a circle and calculate and display its perimeter. End-of-topic questions 5 1. Write a narrative algorithm that will accept the radius of a circle and calculate and display its area. 2. Write a pseudocode algorithm that will accept three numbers and calculate and display the largest of the three. 3. Write a pseudocode algorithm that will accept the marks in a test for a group of 25 students then calculate and display the average mark. 4. Add steps to the previous algorithm so it also displays the highest mark. Check your progress 1 1. Draw flowcharts for the following programs: a. Program to accept the price of an item and calculate its VAT at 15%. b. Program to accept money in US dollars and convert it to its equivalent local currency. c. Program to accept the length and width of a rectangle and calculate its area. End-of-topic questions 6 1. Draw flowcharts for the following: a. A program that accepts 20 numbers and finds their product. b. A program that accepts 45 numbers and finds the number of zeroes and non-zeroes in them. c. A program that accepts a set of integers and finds the number of positive and negative numbers. The program stops when the user enters 0 for the integer value. d. A program that accepts a set of numbers and finds the smallest among them. The program stops when the user enters 999 as the number. Check your progress 2 1. Create a trace table to determine the output of the following algorithm: Step 1: set x 5 Step 2: set y 10 Step 3: set z 3 Step 4: set x x+y Step 5: set y x +z Step 6: set z x+y+z Step 7: display x, y,z Check your progress 3 Create a trace table to determine the output of the following algorithm: Step 1: set a 10 Step 2: set b 12 Step 3: set c 23 Step 4: set a a+b+c Step 5: set b a-b Step 6: set c b-c Step 7: if a>b then set m a set n b set p c else set m c set n a set p b endif Step 8: display m,n,p Check your progress 4 1. Create a trace table to determine the output of the following algorithm: Step 1: set a 7 Step 2: set x 1 Step 3: While a<>0 set x x + a set a a " 1 Step 4: endwhile Step 5: write x End-of-topic questions 7 1. Create a trace table to determine the output of the following algorithms: Step 1: x 5 Step 2: for i 1 to 10 set x = x + 5 endfor Step 3: write x Check your progress 5 1. What is meant by stepwise refinement or top-down design? 2. List three advantages of using top-down design to solve a problem. End-of-topic questions 8 Explain why a top-down design approach is sometimes used to solve problems. 2. A hotel wants to have a room booking system. When a guest arrives the receptionist would be able to see which rooms are free and allocate one to the guest. When the guest leaves, the room would be marked as free again. Each day the cleaners would be given a list of the rooms that are in use. At any time the receptionist would be able to use the room number to find the name and home address of a guest, or could search the room system for a named guest. Draw a top-down design diagram to show how the room booking system could be developed. End-of-section questions Multiple-choice questions 1. The following are problem-solving stages I. analyse the problem II. suggest possible solutions III. implement and review IV. define the problem V. select the best solution The correct order of stages is: A I, IV, II, III, V B IV, I, II, V, III C IV, II, I, V, III D I, II, IV, III, V 2. Which one of the following is a variable? A x B x C 5 D 5 3. To store fractional values, use the data type: A integer B floating point C character D string A. B 4. Which of the following is not a characteristic of a good algorithm? A precise B finite number of steps C ambiguous D logical flow of control 5. Diagrammatic representation of an algorithm is: A flowchart B data flow diagram C algorithm design 6. Which of the following is/are control structures? A selection B sequencing C repetition D all of the above 7. An example of a bounded iteration statement used in algorithm is: A whileendwhile B whilewend C forendfor D repeatuntil 8. Which one of the following is a selection construct used in algorithms? A while endwhile B if then - else C for endfor D repeat-until 9. Which one of the following involves a logical operation? A x>y B x>=y C x>y and x=y D x< >y 10. Consider the following algorithm segment: x = x+y y = x " y write y, x Suppose x = 10 and y = 15, after the completion of the above statements, the values of x and y will be: A 25 and 10 B 10 and 25 C 10 and -5 D -5 and 10 Structured questions 1 a. List the main stages of problem-solving process for computer-based problem-solving. b. For each of the stages identified in 1a above, briefly describe the activities that are involved in it. 2. IPO diagrams can be used to break down a problem into its components. a. State what is meant by IPO diagrams? b. Create an IPO chart for the following problem statement: Accept the values of length and width of a rectangle and calculate its area 3. a. 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