/* --------------------------------------------------------------------------  
// Figure 7.31  Can you guess my number?                                        
// Figure 7.32  Guessing a number.                                              
// -------------------------------------------------------------------------- 
*/
#include "tools.h"  

void one_game( int tries );  

#define TOP 1000                                  /* Top of guessing range. */

void main( void )                                                                                                              
{  
    int do_it_again;                              /* repeat-or-stop switch */ 
    const int tries = ( log( TOP ) / log (2 ) );  /* This is one too few.  */
    
    banner();   
    puts( "\n This is a guessing game.\n"
          " I will think of a number and you must guess it.\n" ); 
    srand( (unsigned) time( NULL ) );       /* seed random number generator */

    do { one_game( tries );
         printf( " \n\n Enter '1' to continue or '0' to quit: " ); 
         scanf( "%i", &do_it_again );           
    } while (do_it_again != 0);

    bye();            
} 

/* -------------------------------------------------------------------- 
// Play the game once. 
*/
void one_game( int tries )
{   
    int k;                                        /* Loop counter. */
    int guess;                                    /* User's input. */
    const int num = 1 + rand() % TOP;             /* The hidden value. */

    printf( " My number is between 1 and %i;" 
            " I will let you guess %i times.\n"
            " Please enter a guess at each prompt.\n", TOP, tries );

    for (k = 1; k <= tries; ++k) {
        printf( "\n Try %i: ", k );
        scanf( "%i", &guess );
        if (guess == num) break;
        if (guess > num) printf( " No, that is too high.\n" );
        else printf( " No, that is too low.\n" );
    }
    if (guess == num) printf( " YES!!  That is just right.  You win! \n" );
    else printf( " Too bad --- I win again!\n" );
}