Tutorial 3 1 X C. = where f is frequency (Hz), C is the capacitance (F) Pseudocode

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1 Tutorial 3 Pseudocode 1. Using pseudocode design a program to read 3 numbers from the keyboard, add them together, and display the result on the screen. 2. Using pseudocode design a program to calculate the reactance of a capacitor. All values required should be entered by the user. 1 X C = where f is frequency (Hz), C is the capacitance (F) 2πfC 3. Using pseudocode design a program to calculate the total resistance of 2 resistors in series or parallel. The user should enter the values of the resistances and whether or not the resistors are in series or in parallel. 4. Using pseudocode design a program that finds the sum of a set of consecutive numbers between the starting value and the ending value entered by the user. The value of the counter and the progessive sum should be displayed on the screen as the program is calculating. Once the sum has been found, the final result should be displayed with an appropriate message. eg. for numbers between 1 and 4, the program would output the following: The sum is 10 Note: The sum of the numbers between 1 and 10 inclusive is Using pseudocode design a program for a guessing game between 1 and 10. The player is to guess the number and if the player guesses the number then the player wins. If the player doesn t guess the number then the program will keep asking the player to enter a new number until the player wins. Specifically: the program would find a random number, and then ask the player to guess the number. The program should tell the player if the number was greater than, or smaller than the random number. If the number equals the random number then You Win!! is displayed and the program ends. Otherwise the program should keep asking the player to guess the number until the player finally guesses the number. The random number can be found using the following module. The module will find a random value in the range defined by start and end. Eg. start=5 and end=7 gives a random number between 5 and 7 inclusive. Assume that this module is already written for you. random(in:start,end OUT:random_ value) 6. Using pseudocode design a program to find the reactance of a 1mH inductor in the frequency range 1K to 100K Hz using 1KHz intervals. Use a module to calculate the reactance. The module should be called from the loop. X L = 2πfL where f is frequency (Hz), L is the inductance (H)

2 Solutions 1) Get input Calculate result Display result PROGRAM ADD read num1from keyboard read num2 from keyboard read num3 from keyboard set result = num1 + num2 + num3 write result to screen 2) Get input Calculate result display result PROGRAM CAPACITOR_REACTANCE read cap from keyboard read freq from keyboard set xc = 1 / ( 2 * pi * freq * cap) write xc to screen

3 3) get input calculate resistance display results 4) PROGRAM CALC_RES write Enter whether series or parallel to screen read ser_or_par from keyboard read r1 from keyboard read r2 from keyboard IF (ser_or_par = series) set total = r1 + r2 ELSE set total = (r1 * r2) / (r1 + r2) write total to screen get input for k = start to end calculate sum PROGRAM SUM write Enter the start value to screen read loop_start from keyboard write Enter the end value to the screen read loop_end from keyboard sum = 0 FOR counter IS loop_start TO loop_end DO set sum = sum + counter write counter,sum to screen write Total sum is sum to screen

4 5) Note: There are different ways of doing this problem. The methods below all use a flag variable. guess random number while input not equal to = check number against random number display result PROGRAM GUESS1 // While method set leave = false random(in:1,10 OUT:rand) // get the random number. WHILE (leave = false) DO write Enter your guess read guess from keyboard IF (guess < rand) write < to screen IF (guess > rand) write > to screen IF (guess = rand) write You Win! to screen set leave = true PROGRAM GUESS2 // Repeat-Until method set leave = false // assuming a random function. This is for illustration purposes only. // The question would give the form of any function required. random(in:1,10 OUT:rand) REPEAT Write Enter your guess to screen read guess from keyboard IF (guess < rand) write < to screen IF (guess > rand) write > to screen IF (guess = rand) write You Win! to screen set leave = true UNTIL (leave = true)

5 6) for f = 1k to 10k calc_impedance display impedance module: z = 2πfL PROGRAM INDUCTOR_REACTANCE: set L = 1m FOR f IS 1k TO 100K STEP 1K DO calc_reactance(in: f,l OUT: z) write z to screen MODULE calc_reactance(in: freq, L set result = 2*pi*freq*L OUT: result) // the value for pi can be assumed