1 Short Answer (15 Points Each)
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1 COSC 7 Exam # Solutions Spring 08 Short Answer (5 Points Each). Write a method called RollCount that takes in two integer parameters rolls and target. The method should simulate the rolling of two die, rolls times, and count the number of rolls that result in the target value. The method should return that count. public static int RollCount(int rolls, int target) { int count = 0; 3 for (int i = 0; i < rolls; i++) { int die = (int) (Math.random() * 6) + ; 5 int die = (int) (Math.random() * 6) + ; 6 if (die + die == target) 7 count++; 8 } 9 return count; 0 }. Write a method called ExtractFirst that takes a single string as a parameter, extracts the first word from the string and returns that word. public static String ExtractFirst(String s) { int pos = s.indexof(" "); 3 String sub = s.substring(0, pos); return sub; 5 } 3. Write a method called InputIntRange that takes in two integer parameters min and max. The method should continually ask the user to input an integer value until the input value is between min and max (inclusively). Once the input is in the range the method should return that value. public static int InputIntRange(int min, int max) { Scanner kb = new Scanner(System.in); 3 int value = 0; do { 5 System.out.print("Input an integer: "); 6 value = kb.nextint(); 7 } while (value < min value > max); 8 return value;. Write a method called DoubleFactorial that takes a single integer parameter n and returns the double factorial of n. The double factorial of a number n is defined to be n!! = n (n ) (n ) We define 0!! = and if the value of n is less than 0 simply have the method return. For example,!! = = 8, 5!! = 5 3 = 5, 6!! = 6 = 8, and 0!! = = 380. public static int DoubleFactorial(int n) { if (n < 0) 3 return -; 5 int df = ; 6 for (int i = n; i > 0; i-=) 7 df *= i; 8 return df;
2 COSC 7 Exam # Solutions Spring 08 Program Traces (5 Points Each). For each of the given inputs, write the output of the program. import java.util.scanner; 3 public class ExamTrace { 5 public static int mth(int b, int c, int a) { 6 System.out.println(""); 7 System.out.println(a + " " + b + " " + c); 8 return a - b * c; 0 public static int mth(int a, int b, int c) { System.out.println("In Method "); 3 System.out.println(a + " " + b + " " + c); if (a > b) 5 return mth3(a, b, c); 6 else 7 return mth3(b, a, c); 8 } 9 0 public static int mth3(int c, int b, int a) { System.out.println(""); System.out.println(a + " " + b + " " + c); 3 return mth(a, b, c); } 5 6 public static int mth(int b, int a, int c) { 7 System.out.println("In Method "); 8 System.out.println(a + " " + b + " " + c); 9 if (a > b && b > c) 30 return a; 3 else if (a > b) 3 return c; 33 else 3 return mth(c, b, a); 35 } public static void main(string[] args) { 38 Scanner kb = new Scanner(System.in); 39 System.out.print("Input: "); 0 int a = kb.nextint(); int b = kb.nextint(); int c = kb.nextint(); 3 System.out.println(mth(a, b, c)); 5 System.out.println(); 6 System.out.println(mth(a, b, c)); 7 System.out.println(); 8 System.out.println(mth(a, b, c)); 50 } (a) Input: 3 3 In Method In Method 3 3 (b) Input: In Method In Method 3 In Method 3 3 3
3 COSC 7 Exam # Solutions Spring 08. For each of the given inputs, write the output of the program. import java.util.scanner; 3 public class ExamTrace { 5 public static String DoSomething(String str, String str, int p) { 6 str += " "; 7 int c = 0; 8 int pos = -; 9 while (c < p) { 0 pos = str.indexof(str, pos + ); if (pos >= 0) c++; 3 else return "Error"; 5 } 6 c = pos; 7 while (str.charat(c)!= ) { 8 c--; 0 c++; pos = str.indexof(" ", c); return str.substring(c, pos); 3 } 5 public static void main(string[] args) { 6 Scanner kb = new Scanner(System.in); 7 System.out.print("Input String: "); 8 String s = kb.nextline(); 9 System.out.print("Input String: "); 30 String s = kb.nextline(); 3 System.out.print("Input Number: "); 3 int a = kb.nextint(); 33 System.out.print(DoSomething(s, s, a)); 3 } 35 } (a) Input String: Methods are also known as functions and subroutines. Input String: o Input Number: functions Values of pos in the loop:, 5, 9, 3 Final value of c: 6 (b) Input String: Methods are also known as functions and subroutines. Input String: s Input Number: also Values of pos in the loop: 6, Final value of c: 3
4 COSC 7 Exam # Solutions Spring 08 3 Coding (0 Points) Do one and only one of the following exercises.. Write a program that will simulate rolling die repeatedly until you get a run of face values from up to a given number. That is, a run of would be rolling a, then 3, a run of 3 would be rolling a, 3, consecutively, a run of would be rolling, 3,, 5 consecutively, and so on. Have the program count the number of rolls needed for each possible run. The output should look like the following. Number of rolls needed for a run from to 3 = 353 Number of rolls needed for a run from to = 836 Number of rolls needed for a run from to 5 = 7587 Number of rolls needed for a run from to 6 = 755 Number of rolls needed for a run from to 7 = 5055 Number of rolls needed for a run from to 8 = 3705 Number of rolls needed for a run from to 9 = Number of rolls needed for a run from to 0 = Number of rolls needed for a run from to = Number of rolls needed for a run from to = public class ExamProgram { 3 public static void main(string[] args) { for (int run = 3; run <= ; run++) { 5 boolean done = false; 6 int target = ; 7 long count = 0; 8 while (!done) { 9 int die = (int) (Math.random() * 6) + ; 0 int die = (int) (Math.random() * 6) + ; int roll = die + die; 3 if (roll == target) target++; 5 else 6 target = ; 7 8 count++; 9 if (target == run + ) 0 done = true; } 3 System.out.println("Number of rolls needed for a run from to " + run + " = " + count); } 5 } 6 }
5 COSC 7 Exam # Solutions Spring 08. Write a program that will take an input string from the user and count the number of vowels in each word. The main program should take the input string and extract each word of the string, one by one. It should then call the a method that takes in a string, assumed to be a single word, counts the number of vowels and returns that number to the main. The main program should also print out the word and vowel count. The output should look like the following. Input String: Methods are also known as functions and subroutines Word: Methods Count = Word: are Count = Word: also Count = Word: known Count = Word: as Count = Word: functions Count = 3 Word: and Count = Word: subroutines Count = 5 import java.util.scanner; 3 public class ExamProgram { 5 public static int CountVowels(String s) { 6 int count = 0; 7 s = s.tolowercase(); 8 for (int i = 0; i < s.length(); i++) { 9 char ch = s.charat(i); 0 if (ch == a ch == e ch == i ch == o ch == u ) count++; } 3 return count; } 5 6 public static void main(string[] args) { 7 Scanner kb = new Scanner(System.in); 8 System.out.print("Input String: "); 9 String s = kb.nextline(); 0 s = s + " "; int pos = 0; while (pos >= 0) { 3 int start = pos; pos = s.indexof(" ", pos + ); 5 if (pos >= 0) { 6 String word = s.substring(start, pos); 7 word = word.trim(); 8 int count = CountVowels(word); 9 System.out.println("Word: " + word + " Count = " + count); 30 } 3 } 3 } 33 } 5
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