/* ----------------------------------------------------------------------  
//  Figure 6.16:  A cash register program.                                           
//                Compute the sum of the prices entered by the user. 
// ---------------------------------------------------------------------- 
*/

#include "tools.h"  
#define SENTINEL 0.0      

void main( void ) 
{                                                  
    double price;                   /*  The input variable */   
    double sum = 0.0;               /*  Accumulates the sum.  */  

    printf( "\n Please enter prices.  When finished, type 0 to quit.\n"
            " The total price will be printed.\n" 
            "\t Price: " );     
    scanf ( "%lg", &price );        /* Read the first price. */ 

    while (price != SENTINEL) {     /* The sentinel value is 0.0 */
        sum += price; 
        printf( "\t Price: " );             
        scanf ( "%lg", &price );          
    }                                  
    printf( "\n The total price is %g \n", sum );
    bye(); 
}