Missing return statement making triangle program

Question

public String displayType(int side1, int side2,int side3)
    {
        if(( side1+side2 > side3))

            if(( side1==side2) && (side2==side3))//tell if         


        

Answer 1

As the final logic (in your case) will always be true, you do not need the final else if

simply

return ("Scalene Triangle."); 

But what will happen if the below if false?

if(( side1+side2 > side3))

You need to return something.

Answer 2

The reason is that, What happens all of your conditions failed to execute ??

Possible solutions :

• You need to provide an else block there.When you provide a else block, then it is sure that always there is a chance to return the value, either in if or in else .

• A default return statement without regarding if-else, where the returning value should be decide in blocks.

Answer 3

Try this

public String displayType(int side1, int side2,int side3)
{
    if(( side1+side2 > side3)){

        if(( side1==side2) && (side2==side3))//tell if equalateral
        {
            return "Equalateral Triangle.";
        }
        else if (( side1==side2) & (side2 != side3) || (side1 == side3) & (side3 != side1))//tells if isosceles
        {
            return "Isosceles Triangle.";
        }
        else if ((side1 != side2) & (side2 != side3))//tells if scalene
        {
            return "Scalene Triangle.";        

        }
                        }
  else{
     return "Not a triangle";
      }
  }

Answer 4

Compiler is saying that You have to return something,because if all your IF conditions fail then what will it do?

you can do like this:

public String displayType(int side1, int side2,int side3)
{
    if(( side1+side2 > side3))

        {
if(( side1==side2) && (side2==side3))//tell if equalateral
        {
            return ("Equalateral Triangle.");
        }
        else if (( side1==side2) & (side2 != side3) || (side1 == side3) & (side3 != side1))//tells if isosceles
        {
            return ("Isosceles Triangle.");
        }
        else if ((side1 != side2) & (side2 != side3))//tells if scalene
        {
            return ("Scalene Triangle.");        

    }
return ("It is not a triangle");
} // missing return statement here error