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1 Software and Programming 1 Lab 3: Strings & Conditional Statements 20 January 2016 SP1-Lab3.ppt Tobi Brodie 1

2 Lab Objectives This session we are concentrating on Strings and conditional statements. Exercise 1*: ReverseWord (String). The exercise involves using a for loop to manipulate the value of a String variable. In order to complete this exercise you will be using both String and char data types. Exercise 2: RomanNumer (Conditional Statement). This more complex exercise involves the use of the IF/ELSE IF/ELSE conditional. Exercise 3*: RomanDigit (Method). This exercise requires you to rewrite the RomanNumber program using a method that can be called with arguments. *Exercises 1 & 3 are both checked exercises and you are required to complete them and show the working programs when requested. We will not be checking this week s exercise 3 until week six, but you should attempt to complete it today. 2

3 Exercise 1 Reverse Word Write a program that reads a word and prints the word in reverse (see JFE, 2 nd Ed, exercise P4.9 on p. 189). For example if the user provides the input "Harry", the program prints yrrah import java.util.scanner; public class ReverseWord public static void main(string[] args) // Use the Scanner java utility package to read a word // from the keyboard using the method in.next() // Use a for loop to print the word in reverse 3

4 Exercise 2 Roman Numerals Write a program that converts a positive integer into the Roman number system. The Roman number system has digits I (1), V (5), X (10), L (50), C(100), D(500) and M(1000). Numbers up to 3999 are formed according to the following rules: a) As in the decimal system, the thousands, hundreds, tens and ones are expressed separately. b) The numbers 1 to 9 are expressed as: 1 I 4 IV 2 II 5 V 3 III 6 VI 7 VII 8 VIII 9 IX (An I preceding a V or X is subtracted from the value, and there cannot be more than three I s in a row.) c) Tens and hundreds are done the same way, except that the letters X, L, C, and C, D, M are used instead of I, V, X, respectively. Your program should take an input, such as 1978, and convert it to Roman numerals, MCMLXXVIII (JFE, 2 nd Ed, exercise P3.26 on p. 130.) 4

5 Hints: Exercise 2 (3): Conversion Algorithm 1. Use the following method to convert a positive number into Roman numerals and return it as a string. public static String convert(int n) 2. Inside the method, write an if statement to check for numbers in the range 0 to If the above is valid, apply the following rules: i. Use if and for statements to convert numbers in the range 1 and 9 into Roman numerals. Note: an I preceding a V or X is subtracted from the value, and there cannot be more than three I s in a row. ii. Tens and hundreds are done in the same way, using if and for statements, except that the letters X, L, C and C, D, M are used. 5

6 Exercise 2: Basic structure of Class RomanNumber /** Roman Number system class **/ import java.util.scanner; public class RomanNumber public static void main(string[ ] args) /* write code to take an input and store it in a variable, number */ /* call method convert */ String romanstr = convert(number); // Output value returned from the convert method. 6

7 Exercise 2: Basic structure of Class RomanNumber (2) public static String convert(int n) // declare a String to store result String roman = ""; // write code to convert the number, n, into Roman numerals if ((n >= 1) && (n <= 3999)) /* Step 1 Determine how many thousands, hundreds, tens and units are in the given number, n */ int thousand = (n / 1000); int hundred = (n % 1000) / 100; int ten = to do ; // write formula to find the tens int unit = to do ; // write formula to find the units // see next slide 7

8 Exercise 2: Basic structure of Class RomanNumber (3) // continuation of the method convert() /* Step 2 Convert the thousands into a Roman numeral and append it to the string roman*/ /* Step 3 Convert the hundreds and append it */ /* Step 4 Convert the tens and append it */ /* Step 5 Convert the units and append it */ else roman = "Number can t be converted "; // return value stored in variable roman return roman; // end of method convert() // end of class RomanNumber 8

9 Exercise 2: Step 2 convert the thousands into a Roman numeral if (thousand > = 1) if (thousand == 1) roman += "M"; else if (thousand == 2) roman += "MM"; else roman += "MMM"; 9

10 Exercise 2: Step 3 convert the hundreds into a Roman numeral if (hundred >= 1) if (hundred == 1) roman += "C"; else if (hundred == 2) roman += "CC"; else if (hundred == 3) roman += "CCC"; else if (hundred == 4) roman += "CD"; else if (hundred == 5) roman += "D"; else if (hundred == 6) roman += "DC"; else if (hundred == 7) roman += "DCC"; else if (hundred == 8) roman += "DCCC"; else roman += "CM"; 10

11 Exercise 2: Steps 4 & 5 convert the tens and units into a Roman numerals The code required for steps 4 and 5 is similar to that used to convert the hundreds into a Roman numeral (step 3). In step 4 you will be replacing the letters C and D with the letters X (10) and L (50) respectively. Step 5 follows the same format, but replacing with the numerals for units: I (1) and V (5). 11

12 Exercise 3 Rewrite the Roman number system program by implementing and using the following method: public static String romandigit(int n, String one, String five, String ten) The above method translates one decimal digit, using the strings specified for the one, five and ten values. You would call the method as follows: romanunits = romandigit(n % 10, "I", "V", "X"); n = n / 10; romantens = romandigit(n % 10, "X", "L", "C"); 12

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