[SOLVED] loop

I'm coming up with an error on the loop its telling me it is already defined and incompatible what am I doing wrong?

Code:

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import java.util.Scanner;

public class CheckTriangles {

    public static void main(String[] args) {
   
    Scanner input=new Scanner(System.in);
   
    int con;
    do{
    //Prompt user to enter side values
    System.out.print("Enter side 1 value: ");
    double side1=input.nextDouble();
    System.out.print("Enter side 2 value: ");
    double side2=input.nextDouble();
    System.out.print("Enter side 3 value: ");
    double side3=input.nextDouble();
   
    if(isValid(side1,side2,side3)){
    //invoke the area of the valid triangle
    System.out.println("The area is: " + area(side1,side2,side3));}
   
    else{
            System.out.println("The triangle is invalid and therefore area cannot be found");
    }
    System.out.print("Would you like to continue? 1=yes 2=no ");
          int con=input.nextInt();
    }while(con=1);
   
    System.out.println("This program was written by Justeena Leonard");
    }
    public static boolean isValid(double side1, double side2, double side3){
            if(side1+side2>side3&&side2+side3>side1&&side1+side3>side2)
                    return true;
            else
                    return false;
            }
  public static double area(double side1, double side2, double side3){
          double s=(side1+side2+side3)/2;
          double area=Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
          return area;
  }
   
    }

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Code:

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import java.util.Scanner;

public class CheckTriangles {

    public static void main(String[] args) {
   
    Scanner input=new Scanner(System.in);
   
    [COLOR="Yellow"][COLOR="Red"]int con;
    do{[/COLOR][/COLOR]
    //Prompt user to enter side values
    System.out.print("Enter side 1 value: ");
    double side1=input.nextDouble();
    System.out.print("Enter side 2 value: ");
    double side2=input.nextDouble();
    System.out.print("Enter side 3 value: ");
    double side3=input.nextDouble();
   
    if(isValid(side1,side2,side3)){
    //invoke the area of the valid triangle
    System.out.println("The area is: " + area(side1,side2,side3));}
   
    else{
            System.out.println("The triangle is invalid and therefore area cannot be found");
    }
    [COLOR="red"]System.out.print("Would you like to continue? 1=yes 2=no ");
          int con=input.nextInt();
    }while(con=1);[/COLOR]
   
    System.out.println("This program was written by Justeena Leonard");
    }
    public static boolean isValid(double side1, double side2, double side3){
            if(side1+side2>side3&&side2+side3>side1&&side1+side3>side2)
                    return true;
            else
                    return false;
            }
  public static double area(double side1, double side2, double side3){
          double s=(side1+side2+side3)/2;
          double area=Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
          return area;
  }
   
    }

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For future reference post your error message to make the error easier for us to find.

However I think your error is in

Code:

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while(con=1) { ...

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which should be

Code:

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while(con == 1) { ...

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Also it looks like you declare the variable "con" twice.

Code:

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int con = input.nextInt();

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should be

Code:

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con = input.nextInt();

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thank you very much