Question

John was asked to write a Java code to calculate the surface area of a cone, the following code was written by him:

Surface area of cone is A = πrl        `l = sqrt(r^2 + h^2)`

class area
{ double area (double r, double h)
 { double l, a;
 a=22.0/7*r*l;
 l=Math.sqrt(r*r+h*h);
 return a;
 }
}

Specify the type of the error in the above program, correct and write the program to be error free.

Answer 1

Logical Error: Area has been calculated before calculation of 1.

class area

{

double area(double r, double h)

{
I=Math.sqrt(r*r + h*h)
a=22.0/7*+*1;
return a;
   }
}