primenumbers.cpp

C++大学简明教程,解压就行没有密码。希望对大家有用

// Exercise 10.17: PrimeNumbers.cpp
// Determines all prime numbers between a user-specified range.
#include <iostream> // required to perform C++ stream I/O
#include <cmath>    // required to use the sqrt function

using namespace std; // for accessing C++ Standard Library members

// function main begins program execution
int main()
{
   // define variables
   int lowerBound; // lower bound
   int upperBound; // upper bound
   int counter;    // counter value

   // prompt user for and input lower bound
   cout << "\nEnter lower bound: ";
   cin >> lowerBound;

   // prompt user for and input upper bound
   cout << "Enter upper bound: ";
   cin >> upperBound;

   // validate the input values
   if ( ( lowerBound <= 0 ) || ( upperBound <= 0 ) )
   {
      cout << "\nBounds must be greater than 0\n" << endl;
   } // end if
   else if ( upperBound < lowerBound )
   {
      cout << "\nUpper bound cannot be less than lower bound\n" 
           << endl;

   } // end else if
   else
   {
      cout << "\n";  // add newline for readability

      // loop from lower bound to upper bound
      for ( counter = lowerBound; counter <= upperBound; counter++ )
      {
         // if prime number, display the value
         if ( true )
         {
            cout << counter << endl;
         } // end if

      } // end for

      cout << "\n";  // add newline for readability

   } // end else

   return 0; // indicate that program ended successfully

} // end function main


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