if and else statements not working java

Question

Hi I am trying to take in an integer between 1 and 10. If the user does not do so would like the program to run again. I believe that I need to use an else if statement that calls on my function but I do not know how to call functions in java.

Here is my code so far:

import java.util.Scanner;
public class NumChecker {
     public static void main(String[] args){

         Scanner in = new Scanner(System.in);
         System.out.print("Enter a number between 1 and 10: ");
         int num1 = in.nextInt();
         if (num1 >= 1 && num1 <= 10); {
             System.out.println("Input = " + num1);
             }

         else if {
         ???
         }


     }

}

A silly mistake we make atleast once in life span. `;` after `if` — SacJn, Oct 20 '15 at 08:58

score 2 · Answer 1 · edited May 23 '17 at 11:44

2

if-else always work.

You made a mistake in the if statement.

there is no ; for an if

if (num1 >= 1 && num1 <= 10) {//no semicolon
   System.out.println("Input = " + num1);
}
else if(num < 0) {//should have a condition
...
}
else
{
... 
}

What happens if I put a semicolon at the end of an if statement?.

How do I ask the user again if the input is not in between 1 and 10?

Loop until you get what you want :)

Scanner sc = new Scanner(System.in);
int num = 0;
while(true)
{
 num = sc.nextInt();
 if(num > 0 && num < 11)
  break;
 System.out.println("Enter a number between 1 and 10");
}
System.out.println(num);

edited May 23 '17 at 11:44

Community

1
1

answered Oct 20 '15 at 08:57

Uma Kanth

5,659
2
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why would you use a `while(true)` and an `if` statement that contains a `break;`, instead of using `while(num < 1 || num > 10)`? – noodlez040 Oct 20 '15 at 09:35
@noodlez040 I wanted the whole reading logic inside the loop. :) – Uma Kanth Oct 20 '15 at 10:16

score 1 · Accepted Answer · answered Oct 20 '15 at 09:05

Since you are expecting a number between 1 to 10, but you don't know how many numbers you will get until you get a valid number, I'd suggest to use a while loop, like so:

import java.util.Scanner;
public class NumChecker {
    public static void main(String[] args){

        Scanner in = new Scanner(System.in);
        System.out.print("Enter a number between 1 and 10: ");
        int num1 = in.nextInt();
        while (num1 < 1 || num1 > 10) {
            System.out.print("Invalid number, enter another one: ");
            num1 = in.nextInt();
        }
        System.out.println("Input = " + num1);
     }
}

if and else statements not working java

2 Answers2

if-else always work.