#include using namespace std; void printHello() {cout << "Hello!" << endl;} void printSmth(string smth) {cout << smth << endl;} int square4all(int a) {return a*a;} double square4all(double a) {return a*a;} void changeTo40(int& x) {x = 40;} void printInt(int a=6) {cout << a << endl;} int main() { // Output cout << "Hello, world!" << endl; // Variables, increment and decrement cout << "Variables, increment, decrement" << endl; int a; a = 3; int b = ++a; cout << b-- << " " << a << endl; cout << b << endl; cout << endl; // Arrays cout << "Arrays" << endl; float someArrayOfFloats[5] = {3.141, 66.6, 4.2}; someArrayOfFloats[4] = 4.04; cout << someArrayOfFloats[2] << endl << endl; // For loop, break, continue, if-else if-else cout << "For loop, break and continue, if-else if-else" << endl; for (int i = 0; i < 5; i++) { if (i == 1) continue; else if (i == 4) break; else cout << "someArrayOfFloats[" << i << "] = " << someArrayOfFloats[i] << endl; } cout << endl; // Switch-case-default cout << "Switch-case-default" << endl; int day = 3; switch (day) { case 0: cout << "Monday"; break; case 1: cout << "Tuesday"; break; case 2: cout << "Wednesday"; break; case 3: case 4: cout << "Thursday or friday"; break; default: cout << "Not a day, saturday or sunday"; } cout << "\n\n"; // Input int n; cout << "Input number: "; cin >> n; cout << endl << "You entered " << n << ", and square of " << n << " is " << n*n << endl << endl; // Pointers cout << "Pointers" << endl; int x = 42; int *p = &x; cout << "Address of x is " << &x << endl; cout << "Value of x is " << x << endl; cout << "Address of p is " << &p << endl; cout << "Value of p is " << p << endl; cout << "Value of variable stored in p is " << *p << endl << endl; // Functions printHello(); printSmth("lol"); cout << square4all(4) << endl << square4all(3.5) << endl; int y = 5; cout << y << endl; changeTo40(x); cout << y << endl; printInt(); cout << "\n\nTHE END" << endl; return 0; }

9th day of learning C++