Question

If you need to write a do-while loop that will ask the user to enter a number between 2 and 5 inclusive, and will keep asking until the user enters a correct number, what is the loop condition?

Answer 1

/*

Write an expression that executes the loop while the user enters a number greater than or equal to 0.

Note: These activities may test code with different test values. This activity will perform three tests,

with user input of 9, 5, 2, -1, then with user input of 0, -17, then with user input of 0 1 0 -1.

*/

import java.util.Scanner;

public class NonNegativeLooper {

public static void main (String [] args) {

Scanner scnr = new Scanner(System.in);

int userNum;

userNum = scnr.nextInt();

while ( userNum >= 0 ) {

System.out.println("Body");

userNum = scnr.nextInt();

}

System.out.println("Done.");

}

}

Step-by-step explanation:

while ( userNum >= 0 ) { // this line executes the loop while the user enters a number greater than or equal to 0.

Answer 2

No, a do loop only loops once. You should use a While loop or For loop, Example below in C++:

for (tries = 0; ; tries++){
if (answer == guess)
{
cout << "You guessed it!";
cout << "And it only took you " << tries << " tries.\\";
break;
}
if (answer < guess)
{
cout << "Higher\\"<<endl;
cin >> answer;
}

if ( answer > guess)
{
cout << "Lower\\"<<endl;
cin >> answer;
}
}}