prog5_06.cpp

来自「一本语言类编程书籍」· C++ 代码 · 共 30 行

// Program 5.6 Multiple initializations in a loop expression
#include <iostream>
#include <iomanip>
using std::cout;
using std::cin;
using std::endl;
using std::setw;

int main() {
  int count = 0;
  cout << endl << "What upper limit would you like? ";
  cin >> count;

  cout << endl
       << "integer"                   // Output column headings
       << "     sum"
       << "       factorial"
       << endl;

  for(long n = 1, sum = 0, factorial = 1 ; n <= count ; n++) {
    sum += n;                     // Accumulate sum to current n
    factorial *= n;               // Calculate n!
    cout << setw(4) << n   << "    "
         << setw(7) << sum << " "
         << setw(15) << factorial
         << endl;
  }
  return 0;
}