/* ECP: FILEname=fig4_10.c */
/* 1*/   #include <stdio.h>
/* 2*/   #include "prime.h"

/* 3*/   /* Return An Odd Starting Number */
/* 4*/   unsigned long int
/* 5*/   FirstTrial( void )
/* 6*/   {
/* 7*/       unsigned long int StartingNum;

/* 8*/       printf( "Enter a starting number: " );
/* 9*/       if( scanf( "%lu", &StartingNum ) == 1 )
/*10*/           return StartingNum % 2 ? StartingNum : ++StartingNum;

/*11*/       printf( "Bad number entered\n" );
/*12*/       return 0;
/*13*/   }


/*14*/   /* Find Next Prime After Some Starting Point */
/*15*/   main( void )
/*16*/   {
/*17*/       printf( "Next largest prime is %lu\n",
/*18*/                       FindPrime( FirstTrial( ) ) );
/*19*/   }