Authors:
Stuart Reges, Marty Stepp
Chapter:
Program Logic And Indefinite Loops
Exercise:
Exercises
Question:6 | ISBN:9780136091813 | Edition: 2
Question
Write a method called makeGuesses that guesses numbers between 1 and 50 inclusive until it makes a guess of at least 48. It should report each guess and at the end should report the total number of guesses made. Here is a sample execution:
guess = 43
guess = 47
guess = 45
guess = 27
guess = 49
total guesses = 5
Answer
package indefinite_loops;
import java.util.Random;
public class GuessCount {
public int makeGuesses() {
// use Random class to generate numbers
Random random = new Random();
// to store the random value
int guessedNo;
// keep track of guess count
int numOfGuesses = 0;
// loops infinitely till it met our condition
while (true) {
// since nextInt() method include 0 and exclude 50, add 1; now range becomes 1-50
guessedNo = random.nextInt(50) + 1;
// increment each time it enter loop
numOfGuesses++;
if (guessedNo > 48)
return numOfGuesses;
}
}
public static void main(String[] args) {
GuessCount guessCount = new GuessCount();
int count = guessCount.makeGuesses();
System.out.println("number of guesses it took to guess number at least 48 is: " +count);
}
}
Output:
number of guesses it took to guess number at least 48 is: 28