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//but when i JUST put (DEFAULT_SIZE) in outline definition of the class
//constructor i get this error:no appropriate default constructor available
 
#define DEFAULT_SIZE 10
template<typename T>
class stack {
public:
stack(int size);
private:
T *elements;
int size;
int count;
};
 
template<typename T>
stack<T>::stack(int s=DEFAULT_SIZE) {
cout << "--constructor called\n";
size = s;
elements = new T[size];
count = 0;
}
 
//finally the main of the program:
 
int main() {
stack<int> u;
u.push(4);
}

prog.cpp:16:35: error: redeclaration of 'stack<T>::stack(int)' may not have default arguments [-fpermissive]
 stack<T>::stack(int s=DEFAULT_SIZE) {
                                   ^
prog.cpp: In constructor 'stack<T>::stack(int)':
prog.cpp:17:1: error: 'cout' was not declared in this scope
 cout << "--constructor called\n";
 ^
prog.cpp: In function 'int main()':
prog.cpp:27:3: error: 'class stack<int>' has no member named 'push'
 u.push(4);
   ^

Standard output is empty