Create a new program called minusSentinel2.
Prompt the user to enter whole numbers between 1 and 100. Allow the user to enter as many numbers as desired.
If an invalid number is entered, print "Invalid entry." Prompt the user again until a valid number is entered.
Once -1 is entered, the program stops and prints the largest number entered with the text "The largest number entered is: "
I am having some trouble on the "Invalid entry." part. When I type a number greater than 100, "Invalid entry." does not get printed. How do I fix this? Thank you!
import java.util.*;
public class minusSentinel2
{
public static void main (String[] args)
{
Scanner console = new Scanner(System.in);
System.out.println("Enter a number between 1-100 (type -1 to quit):");
int number = console.nextInt();
int max = number;
if (number < 1 && number > 100)//chekcs if value is valid
{
System.out.println("Invalid entry.");
System.out.println("Enter a number between 1-100 (type -1 to quit).");
console.next();
}
while (number != -1)
{
number = console.nextInt();
if (number > max)
{
max = number;
}
}
System.out.print("The largest number entered is: " + max);
}
}
Firstly, I suggest you to don't copy and paste what we ask you to do, and just reformulates with only necessary parts for us.
For your issue, this condition is wrong:
if (number < 1 && number > 100)
It correspond to "lower than 1 and bigger than 100".
So, instead of &&
(and) operator, use ||
(or) operator like that :
if (number < 1 || number > 100) {
// it's not valid because lower than 1 or greater than 100
}
Finally, what you are doing seems to have another issue. If you enter an invalid number, it will ask again only one time, and not same the new value. So, I suggest you to use while loop like that :
int number = 0;
while(number < 1 || number > 100) {
number = console.nextInt();
if (number < 1 || number > 100) {
System.out.println("Invalid entry.");
System.out.println("Enter a number between 1-100 (type -1 to quit).");
}
}
int max = number;
To conclude, this is the full code:
Scanner console = new Scanner(System.in); // create scanner
int number = 0; // create new variable that will be used outside of while loop
while (number < 1 || number > 100) { // while the number isn't valid
System.out.println("Enter a number between 1-100 (type -1 to quit):");
number = console.nextInt(); // wait for user input
if (number == -1) { // stop program
console.close();
return;
} else if (number < 1 || number > 100) { // number invalid
System.out.println("Invalid entry.");
}
}
System.out.println("Now enter all number that you want. End with -1.");
int max = number; // create new max value
while (number != -1) {
number = console.nextInt();
if (number < 1 || number > 100) { // number invalid
System.out.println("Invalid entry.");
} else if (number > max) { // if number is upper than current one
max = number;
// here you can do something like that:
// System.out.println("New max value: " + max);
} else {
// the value is value but not upper than current one, so we can write:
// System.out.println("This value isn't upper to " + max);
}
}
System.out.print("The largest number entered is: " + max);
console.close();
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