using namespace std;
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// program-structure/ulam.cpp - Read number, print its Ulam sequence. // Michael Maus, 2004-10-26 //========================================================= includes #include <iostream> using namespace std; //======================================================= prototypes int nextUlam(int x); //============================================================= main int main() { int n; // Ulam sequence start cout << "Enter an integer to see its Ulam sequence." << endl; while (cin >> n) { cout << "Ulam sequence for " << n << " is " << n; while (n > 1) { n = nextUlam(n); cout << " " << n; } cout << endl; } return 0; } //========================================================= nextUlam int nextUlam(int x) { int result; if (x%2 == 0) { // if even result = x / 2; } else { // if odd result = 3*x + 1; } return result; } |
A program that defines classes or numerous methods is divided into many source files. To pass common definitions between these files, header files are created which contain declarations.