Please let me know where are the mistakes made I'll rectify them

Question

#include<iostream>
using namespace std;
int perimeter_rectangle (int, double, double); // Prototype
int main ()
{
int length,breadth,answer, side = 2;
cout<<"Enter the Length";
cin >> length;
cout<<"\nEnter the Breadth";
cin >> breadth;
answer = perimeter_rectangle ( side,length, breadth); // call
cout<<"\nThe perimeter of the rectangle with length" << length <<"and" << "breadth" << breadth << "is" << answer;
return 0;
}
int perimeter_rectangle (int x, int y, int z)
{
return (x* (y+z));
}

Answer 1

Dipanjan Basu Error in prototype.
Edit:You have used double in the prototype but you are using only integer in the function.

Answer 2

It should be all int, since you have have declared all variables as int.
See the first line inside main().

Answer 3

So the prototype should be
int perimeter_rectangle ( double, double, double) ;
the rest code is fine?