Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 15 Exercise 1
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 15 Exercise 1
#include "std_lib_facilities.h"
int fac_recursive(int n) { return n > 1 ? n * fac_recursive(n – 1) : 1; } // factorial n!
int fac_iterative(int n)
{
int r = 1;
while (n > 1) {
r *= n;
–n;
}
return r;
}
int main()
try
{
for (int i = 0; i < 21; i++) {
cout << fac_recursive(i) << endl;
}
for (int i = 0; i < 21; i++) {
cout << fac_iterative(i) << endl;
}
keep_window_open();
}
catch (exception& e) {
cerr << "error: " << e.what() << ‘\n’;
keep_window_open();
return 1;
}
catch (…) {
cerr << "Unknown exception!\n";
keep_window_open();
return 2;
}
[/code]
Output: 1 1 2 6 24 120 720 5040 40320 362880 3628800 39916800 479001600 1932053504 1278945280 2004310016 2004189184 -288522240 -898433024 109641728 -2102132736 1 1 2 6 24 120 720 5040 40320 362880 3628800 39916800 479001600 1932053504 1278945280 2004310016 2004189184 -288522240 -898433024 109641728 -2102132736 Please enter a character to exit
