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Thread: variable fact might not have been initialized

  1. #1
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    Default variable fact might not have been initialized

    The frst part of the program is working perfectly fine . The class useTest is linked to another class, Test , which is working out the first part of the program. I have an error in the bottom part of the program , can anyone help please ? thanks


    import java.util.* ;

    public class useTest {
    public static void main ( String args[]) {
    Scanner kb = new Scanner ( System.in) ;
    System.out.print ( "\fPlease enter degrees : " ) ;
    int d = kb.nextInt () ;
    double r = (double)Test.toRadians (d) ;

    System.out.println ( " Degrees is : " + d + " and radians is : " + r ) ;
    }

    public static int fact ( int d, double r ){
    int fact , n , c = 1;
    System.out.println("Enter an integer to calculate it's factorial");
    Scanner kb = new Scanner(System.in);

    n =kb.nextInt () ;

    if ( n < 0 )
    System.out.println("Number should be non-negative.");
    else
    {

    for ( c = 1 ; c <= n ; c++ )
    fact = 1*c ;

    System.out.println("Factorial of "+n+" is = "+ fact); // ERROR IS HERE //
    }

    }
    }


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: variable fact might not have been initialized

    When posting code, please use the highlight tags to preserve formatting.

    What happens if c starts out as greater than n? That might not be logically possible (actually it is if the user enters a 0), but the compiler has no way of knowing that, so it's telling you that there's a chance the fact variable was not initialized before you're trying to print it out.
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  3. The Following User Says Thank You to KevinWorkman For This Useful Post:

    davidjava (March 11th, 2013)

  4. #3
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    Default Re: variable fact might not have been initialized

    Thanks for your suggestion . An error still pops out however , import java.util.* ;

    public class useTest {
    public static void main ( String args[]) {
    Scanner kb = new Scanner ( System.in) ;
    System.out.print ( "\fPlease enter degrees : " ) ;
    int d = kb.nextInt () ;
    double r = (double)Test.toRadians (d) ;

    System.out.println ( " Degrees is : " + d + " and radians is : " + r ) ;
    }

    public static int fact ( int d, double r ){
    int fact = 0 ;
    int c = 1;
    int n = 0;
    System.out.println("Enter an integer to calculate it's factorial");
    Scanner kb = new Scanner(System.in);

    n =kb.nextInt () ;

    if ( n < 0 )
    System.out.println("Number should be non-negative.");
    else
    {

    for ( c = 1 ; c <= n ; c++ )
    fact = 1*c ;

    System.out.println("Factorial of "+n+" is = "+ fact);
    }

    }
    }

  5. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: variable fact might not have been initialized

    Like I said, please use the highlight tags. Also please copy and paste the full text of the error.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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