Theoretically, it is known that a two-sided, equally weighted coin has a 50% cha
ID: 3552532 • Letter: T
Question
Theoretically, it is known that a two-sided, equally weighted coin has a 50% chance of landing on heads and a 50% chance of landing on tails. However, is this really what happens in practice? For example, if you took a penny and flipped it 100 times, would it always produce heads 50 times and tails 50 times? Instead of actually flipping a coin, you will be simulating coin flips to find out how often heads and tails appear. Make heads to be a constant assigned to 1 and tails to be a constant assigned to 2. (For fun, you can also flip an actual coin!)
Phase I - Flip a Coin.
Your program should implement the following methods with partial signatures:
/** getNum method will prompt the user for a whole number and return a positive integer > 0. **/ /** The message for prompting is given by msg. **/ /** In case of invalid input, it will display errorMsg. **/ /** Make sure you validate that the input entered is both a number and a positive integer. **/ /** If the user enter invalid input, your program should show an error message and keep asking. **/ /** (Your program should not stop if the input is invalid!) **/ /** Sample call: int coins = getNum(
Explanation / Answer
import java.util.InputMismatchException;
import java.util.Scanner;
public class Test
{
/** getNum method will prompt the user for a whole number and return a positive integer > 0. **/
public static int getNum(String msg, String errorMsg)
{
Scanner s=new Scanner(System.in);
System.out.print(msg);
int no;
while(true)
{
try
{
String input=s.next();
no= Integer.parseInt(input);
}
catch(Exception ex)
{
System.out.println(errorMsg);
System.out.print(msg);
continue;
}
if(no<=0)
{
System.out.println(errorMsg);
System.out.print(msg);
}
else
{
return no;
}
}
}
/** flipCoin method will return a random flip of the coin returning 1 or 2. **/
public static int flipCoin()
{
return (int) (Math.random() * 2) + 1;
}
/** getFlipType method will return the string
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