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fromctocpp.cpp (2272B)


      1 #include <iostream>
      2 #include <string>
      3 
      4 class Human
      5 {
      6 	private:
      7 		std::string name;
      8 		int age;
      9 
     10 	public:
     11 		Human(std::string name) {this->name = name;}
     12 		std::string getname() const {return name;}
     13 };
     14 
     15 int modconst(int *, int);
     16 void chnames(std::string *, int);
     17 void getnames(std::string *, int);
     18 int chval(int &, int);
     19 int& ref(int *, int);
     20 std::string defaultargs(std::string = "No");
     21 
     22 int main(int argc, char **argv)
     23 {
     24 	// Ερώτημα 1 
     25 
     26 	// Τρόπος 1
     27 	const int x = 10;
     28 	std::cout << "First way" << std::endl;
     29 	std::cout << "Old const value: " << x << std::endl << "New const value: " << modconst((int *)&x, 15) << std::endl << std::endl;
     30 	
     31 	// Τρόπος 2
     32 	int *p = (int *)&x;
     33 	*p = 35;
     34 	std::cout << "Second way" << std::endl;
     35 	std::cout << "Old const value: " << x << std::endl << "New const value: " << *p << std::endl << std::endl;
     36 
     37 	// Ερώτημα 2
     38 	Human *human = new Human("Christos");
     39 	std::string *names = new std::string[3];
     40 	std::cout << human->getname() << std::endl << std::endl;
     41 
     42 	chnames(names, 3);
     43 	std::cout << std::endl;
     44 	getnames(names, 3);
     45 	std::cout << std::endl;
     46 
     47 	delete human;
     48 	delete[] names;
     49 
     50 	// Ερώτημα 3
     51 	int y = 5;
     52 	std::cout << "Old y value: " << y << std::endl << "New y value: " << chval(y, 10) << std::endl << std::endl;
     53 
     54 	int	*arr = new int[3];
     55 	for (int i = 0; i < 2; i++) arr[i] = i;
     56 	std::cout << "Old value at index 1: " << arr[1] << std::endl;
     57 	ref(arr, 1) = 500;
     58 	std::cout << "New value at index 1: " << arr[1] << std::endl << std::endl;
     59 	delete[] arr;
     60 
     61 	// Ερώτημα 4
     62 	std::cout << "Function return values: " << std::endl;
     63 	std::cout << "With default arg: " << defaultargs() << std::endl;
     64 	std::cout << "Without default arg: " << defaultargs("Yes") << std::endl; 
     65 
     66 	return 0;
     67 }
     68 
     69 void chnames(std::string *names, int numNames)
     70 {
     71 	for (int i = 0; i < numNames; i++)
     72 	{
     73 		std::cout << "Name " << i << ": ";
     74 		std::cin >> names[i];
     75 	}
     76 }
     77 
     78 void getnames(std::string *names, int numNames)
     79 {
     80 	for (int i = 0; i < numNames; i++)
     81 		std::cout << "Name " << i << ": " << names[i] << std::endl;
     82 }
     83 
     84 int modconst(int *x, int newVal) {return *x = newVal;}
     85 int chval(int &y, int newVal) {return y = newVal;}
     86 int& ref(int *arr, int index) {return arr[index];}
     87 std::string defaultargs(std::string arg) {return arg;}