Nesting member function and private function C++

Bismillahir Rahmanir Rahim

The addition and average of three numbers input from the keyboard by using  Nesting member function and private function in C++  .

Solution:

#include<iostream.h>
class sum_average
{
 int a,b,c,sum;
 float avg;
 void input();//privat function call
 public:
  void print_line(char ch);
  int add();
  float average();
  void show();
};
void sum_average::print_line(char ch)
{
 for(int i=0;i<=40;i++)
   {
    cout<<ch;
   }
 cout<<endl;
}
void sum_average::input()
 {
  cout<<"Enter your numbers:"<<endl<<"a=";
  cin>>a;
  cout<<"b=";
  cin>>b;
  cout<<"c=";
  cin>>c;
 }

int sum_average::add()
 {
  input();
  sum=a+b+c;
  return sum;
 }

 float sum_average::average()
 {
  avg=sum/3;
  return avg;
 }

void sum_average::show()
 {
  cout<<"The sum of two numbers is= "<<sum<<endl;
  cout<<"The average of two numbers is = "<<avg<<endl;
  print_line('*');
 }
void main()
{
 char n;
 main:
 sum_average obj;
 obj.print_line('*');
 obj.add();
 obj.average();
 obj.show();
 cout<<"If you want to run again press a/A"<<endl;
 cin>>n;
 if(n=='a' ||n=='A')
   goto main;
 else
   cout<<"Thank you"<<endl;
 obj.print_line('#');
}

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