#include <stdio.h>
#include <stdlib.h>

int main(void)
{
   char response[32];
   /*
    * Prompt for input.
    */
   fputs ( "Enter your number: ", stdout );
   fflush ( stdout );
   /*
    * Read user response.
    */
   if ( fgets ( response, sizeof response, stdin ) != NULL )
   {
      /*
       * Attempt to convert user's response into an integer using strtol. The
       * second parameter to strtol allows for greater error checking if used.
       */
      int value = strtol ( response, NULL, 10/* radix or base */ );
      /*
       * No error checking was done, but attempt to display integer value.
       */
      printf ( "value = %d\n", value );
   }
   return 0;
}

/* my output
Enter your number: 12345
value = 12345
*/

#include <iostream>
#include <string>
#include <sstream>

int main(void)
{
   std::string response;
   /*
    * Prompt for input.
    */
   std::cout << "Enter your number: ";
   /*
    * Read user response.
    */
   std::cin >> response;
   /*
    * Attempt to convert user's response into an integer using a stringstream.
    */
   std::istringstream convert(response);
   int value;
   if ( convert >> value )
   {
      std::cout << "value = " << value << std::endl;
   }
   return 0;
}

/* my output
Enter your number: 456879
value = 456879
*/