Thread: Why won't my program compile? (While loop with inputs)

import java.util.Scanner;

public class Factorial {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);
System.out.println("Enter Number ===>> ");

int factorial;
while(input>0)
{
factorial *= input;
input--;
}

System.out.println(factorial);
}
}



The errors I get are:

--------------------Configuration: Factorial - JDK version 1.7.0_25 <Default> - <Default>--------------------
C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:11: error: bad operand types for binary operator '>'
while(input>0)
^
first type: Scanner
second type: int
C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:13: error: bad operand types for binary operator '*'
factorial *= input;
^
first type: int
second type: Scanner
C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:14: error: bad operand type Scanner for unary operator '--'
input--;

Please read the Announcement topic at the top of each/any sub-Forum to learn how to post your code in code tags.

Use the Scanner nextInt() method to get your int variable.

you have not initialized the factorial and input.
take the reference of scanner with different name then assign that reference to input with nextLine() method.
then it will be compiled.