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#include <stdio.h> // C include, /usr/include, /usr/local/include #include <iostream> namespace test { int a = 10; // test::a int b = 78; } using namespace std; using namespace test; int main() { printf ("ahoj C\n"); std::cout << "ahoj C++" << std::endl; std::cout << "jedna" << " dva" << " tri" << std::endl; std::cout << "10 + 30 = " << 10 + 30 << std::endl; int a = 33; std::cout << "a = " << a << ", test::a = " << test::a << std::endl; cout << "a = " << a << ", test::a = " << test::a << endl; cout << "b = " << b << endl; /* std::cout std. vystup std::cin std. vstup std::cerr std. chybovy vystup std::clog std. logovaci vystup */ cout << "zadej cislo datoveho typu int: "; cin >> b; if (cin.good()) cout << "zadal jsi " << b << endl; else cout << "nauc se datove typy" << endl; return 0; }
#include <iostream> #include <iomanip> using namespace std; int main() { float pi = 3.14159265; float pp = 65.876866; float px = 768748.898; cout << pi << endl << pp << endl << px << endl; cout << setprecision(2); cout << pi << endl << pp << endl << px << endl; cout << fixed; cout << "fixed: " << endl << pi << endl << pp << endl << px << endl; cout << setprecision(5); cout << pi << endl << pp << endl << px << endl; cout << scientific; cout << pi << endl << pp << endl << px << endl; cout.unsetf (ios_base::floatfield); cout << pi << endl << pp << endl << px << endl; cout << setw(15) << pi << endl; return 0; }
#include <iostream> void f1(int *a) { *a = 31; } void f2(int &a) { a = 32; } int main() { int x = 10; std::cout << "x = " << x << std::endl; f1 (&x); std::cout << "x = " << x << std::endl; int &y = x; f2 (x); std::cout << "x = " << x << std::endl; return 0; }
#include <iostream> #include <fstream> using namespace std; int main () { ifstream in ("04.cpp"); ofstream out ("04-copy.cpp"); if (in.good ()) { cout << "soubor byl otevren" << endl; string s; while (getline (in, s)) { cout << s << endl; out << s << endl; } } return 0; }