/* Figure 4.5 modified */
/* 
 * Displays message about heart rate. 
 */ 
#include <stdio.h>

int main(void)
{
         int pulse;            /* pulse rate for 20 seconds */
         int rest_heart_rate;  /* resting heart rate for 1 minute */
         
         /* Take and enter your resting pulse rate */	 	  
         printf("Enter the number of heart beats in 20 seconds: ");
         scanf("%d", &pulse);
         
         /* Calculate resting heart rate for 1 minute */
         rest_heart_rate = pulse * 3; 
         printf("Your heart rate is %d.\n", rest_heart_rate);     
         
         /* Display message based on resting heart rate */ 
         if (rest_heart_rate > 60)
         {
             printf("Keep up your exercise program!\n");
         }
         else
         {
             printf("Your heart is in excellent health!\n");
         }		 
         return (0);
}