Don't know what's the error. Reply fast!

[Winkerd]

In 83rd line message says: "Illegal Structure operation". But I didn't use any structures!
What's the problem? And how to correct it?
Please reply fast! Its urgent! :|

#include<iostream.h>
#include<conio.h>
#include<math.h>
int prime(int);
int reverse(int) ;
int power(int,int);
int rectangle(int,int);
int square(int);
int circle(int);
void tables(int);
void main()
{
 clrscr();
 int p, g, m;
 float q, r, k, l, s, t;
 cout<<"This program executes as per your choice."<<endl;
 cout<<"1. Tells whether a number is prime or not."<<endl;
 cout<<"2. Gives the reverse of the number entered by you."<<endl;
 cout<<"3. Computes x^y (x raised to the power y.)"<<endl;
 cout<<"4  Computes the area of a circle, rectangle or a square"<<endl;
 cout<<"5. Displays the multiplication table of a number upto 1st 10 multiples."<<endl;
 cout<<"Enter your choice : ";
 cin>>g;
 switch(g)
 {
  case 1:
     {cout<<"Number is prime -->1. Number is not a prime-->-1"<<endl;
      cout<<"Enter a number: ";
      cin>>p;
      cout<<prime(p);
     }
	 break;
  case 2:
     {
      cout<<"Enter a number: ";
      cin>>p;
      cout<<reverse(p);
     }
	 break;
  case 3:
     {
      cout<<"Enter a number: ";
      cin>>q;
      cout<<"Enter the power to be raised to: ";
      cin>>r;
      cout<<q<<"^"<<r<<" "<<"is: "<<power(q,r);
     }
	 break;
  case 4:
     {
      cout<<"1. Area of Reactagle."<<endl;
      cout<<"2. Area of Square."<<endl;
      cout<<"3. Area of Circle."<<endl;
      cout<<"Enter choice: "<<endl;
      cin>>m;
      if(m==1)
       {
		  cout<<"Enter length and breadth of the rectangle: ";
		  cin>>k>>l;
		  cout<<"Area of rectangle is: "<<rectangle(l,k);

       }
      if(m==2)
       {
		  cout<<"Enter side of square: ";
		  cin>>s;
		  cout<<"Area of square is: "<<square(s);
       }
      if(m==3)
       {
		  cout<<"Enter radius of circle: ";
		  cin>>t;
		  cout<<"Area of circle is: "<<circle(t);
       }
      else
       cout<<"Wrong choice.";
     }
	 break;
  case(5):
     {
      cout<<"Enter a number: ";
      cin>>p;
      cout<<tables(p);
     }
	 break;
  default:
      cout<<"Wrong choice";
 }//switch case closes
 getch();
}//void main closes
int prime(int a)
{ int flag=0;
  for(int i=2; i<=(a/2); i++)
  {
	  while(flag==0)
	  {
		 if(a%i==0)
		  flag++;
	  }
  }
  if(flag==0)
	  return 1;
  else
	  return -1;
}

int reverse(int b)
{
  int j, flag=0, sum=0, y;
  j=b;
  while(j>0)
  { 
	j=j/10;
	flag++;
  }
  while(b>0)
  {
	y=b%10;
	sum+=y*(pow(10,flag));
	flag--;
	b=b/10;
  }
 return sum;
}
float power(float c, float d)
{
	for(int i=0; i<d; i++)
	{
		c*=c;
	}
 return c;
}
float rectangle(float e, float f)
{
	float ar;
	ar= e*f;
	return ar;
}
float square(float h)
{
	float ar;
	ar=h*h;
	return ar;
}
float circle(float i)
{
	float ar;
	ar=3.14*i*i;
	return ar;
}
void tables(int j)
{
       for(int i=1; i<11; i++)
	{
	  cout<<j<<" x "<<i<<"="<<j*i;
	}
}

[abhishekm71]

instead of

83. cout<<tables(p);

just use

83. tables(p);

[ne555]

> In 83rd line message says: "Illegal Structure operation".
Don't paraphrase.
After fixing your headers (is just `iostream', and `cout' is in the `std' namespace)

$ g++ -W{all,extra} foo.cpp 2>&1 | grep error
foo.cpp:83:11: error: no match for ‘operator<<’ in ‘std::cout << tables(p)’

$ clang++ -W{all,extra} foo.cpp 2>&1 | grep error
foo.cpp:83:11: error: invalid operands to binary expression ('ostream' (aka 'basic_ostream<char>') and 'void')

¿do you understand why cout << tables(p); makes no sense?

[Winkerd]

Ok did that. But then it gives 4 linker errors:
Undefined symbol circle(int) in module JOINT.CPP
Undefined symbol square(int) in module JOINT.CPP
Undefined symbol rectangle(int, int) in module JOINT .CPP
Undefined symbol power(int, int) in module JOINT.CPP

:| :/

[ne555]

Maybe you'll want to try to respect the prototype.

[Winkerd]

What do you mean me555?

[ne555]

int power(int,int); //your prototype
float power(float c, float d) //your definition
{
	for(int i=0; i<d; i++)
	{
		c*=c;
	}
 return c;
}

¿Do you see the difference, Vinkerd?