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Saturday, 20 August 2016

Chapter 7 Exercise 13, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.




*7.13 (Random number chooser) Write a method that returns a random number between 1 and 54, excluding the numbers passed in the argument. The method header is specified as follows: public static int getRandom(int... numbers)



import java.util.Scanner;
 
 
public class ProgrammingEx7_13 {
 
 public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
  int[] numbers = new int[10];
 
  System.out.print("Enter 10 integers to exclude from:");
 
  for (int i = 0; i < numbers.length; i++) {
   numbers[i] = input.nextInt();
  }
 
  System.out.println("List of 100 random numbers:");
  for (int i = 0; i < 100; i++) {
   System.out.println(getRandom(numbers));
 
  }
 
 }
 
 public static int getRandom(int... numbers) {
 
  int getRandom = 0;
  boolean flag = true;
 
  // Loop until random number in not an argument list
  while (flag) {
   getRandom = intRandom(1, 54);
   // Assuming that the random number is not in arg list
   flag = false;
   // Test the assumption
   for (int i : numbers) {
    // If assumption is false, reset flag to true to generate new
    // random number
    if (getRandom == i) {
     flag = true;
     break;
    }
   }
  }
 
  return getRandom;
 }
 
 // Generate random integer between upper and lower bound
 public static int intRandom(int lowerBound, int upperBound) {
  return (int) (lowerBound + Math.random()
    * (upperBound - lowerBound + 1));
 }
 
}

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