If anyone can explain why this code doesn't work:
And why this code works for case 1 but not case 2:Code:#include <iostream.h> //******************************* Node class ********************************************* class Node{ char data; Node *next; public: Node() : data(0), next(0){} Node(char e) : data(e), next(0){} friend class myString; friend ostream& operator << (ostream& os, const Node& x); friend ostream& operator << (ostream& os, const myString& str); }; ostream& operator << (ostream& os, const Node& x){ os << x.data; return os;} //******************************** myString prototypes ****************************************** class myString{ Node *head; public: myString(); int addRear(char ch); friend ostream& operator << (ostream& os, const myString& str); friend istream& operator >> (istream& is, myString& str); }; //*********************************** myString Functions *********************************** myString :: myString() : head(0) {} int myString :: addRear(char ch){ if (! head) { // adding to empty list head = new Node(ch); return 1;} Node *temp = head; while (temp -> next) // find end of list temp = temp -> next; Node *newone = new Node(ch); temp -> next = newone; return 1;} ostream& operator << (ostream& os, const myString& str) { Node *temp = str.head; while (temp) { os << *temp; temp = temp -> next;} delete temp; return os;} istream& operator >> (istream& is, myString& str){ char ch; while(ch != '\n' && ch != ' '){ cin.get(ch); if(ch != '\n' && ch != ' ') str.addRear(ch);} return is;} //*********************************** MAIN ******************************************************* void main (void){ myString a , b; int op; cin >> op; switch(op){ case 1: cin >> a; cout << a; break; case 2: cin >> b; cout << b; break; } }
If you can explain this, I will give you $0.01 U.S. currency.Code:#include <iostream.h> //******************************* Node class ********************************************* class Node{ char data; Node *next; public: Node() : data(0), next(0){} Node(char e) : data(e), next(0){} friend class myString; friend ostream& operator << (ostream& os, const Node& x); friend ostream& operator << (ostream& os, const myString& str); }; ostream& operator << (ostream& os, const Node& x){ os << x.data; return os;} //******************************** myString prototypes ****************************************** class myString{ Node *head; public: myString(); int addRear(char ch); friend ostream& operator << (ostream& os, const myString& str); friend istream& operator >> (istream& is, myString& str); }; //*********************************** myString Functions *********************************** myString :: myString() : head(0) {} int myString :: addRear(char ch){ if (! head) { // adding to empty list head = new Node(ch); return 1;} Node *temp = head; while (temp -> next) // find end of list temp = temp -> next; Node *newone = new Node(ch); temp -> next = newone; return 1;} ostream& operator << (ostream& os, const myString& str) { Node *temp = str.head; while (temp) { os << *temp; temp = temp -> next;} delete temp; return os;} istream& operator >> (istream& is, myString& str){ char ch; while(ch != '\n' && ch != ' '){ cin.get(ch); if(ch != '\n' && ch != ' ') str.addRear(ch);} return is;} //*********************************** MAIN ******************************************************* void main (void){ myString a , b; int op; cin >> op; switch(op){ case 1: cin >> a; cout << a; case 2: cin >> b; cout << b; } }
(Hint: The last code doesn't use 'break' in the switch/case statement.)
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