How can I create my own functions in C++?

Question

I want to build my own library in C, can someone help me with this?

Answer 1

If you want to create you function in main(), then there is no difference for creating function in C or C++; Now, if you want to create your function in class, (c++)

#include<iostream.h>
class sample
{       
    public:
        int a,b;
        int sum(int x,int y)
        {
        return x+y;
        }
};

main()
{
  sample o1;
  int result;
  o1.a=10;
  o1.y=20;
  result = o1.sum(a,b);
  cout << "sum = " << result;    
}