C 程式設計作業一，選擇邏輯：解題

/* C Programming Project 1 */

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

int main(void) {
   int adultNum, childNum, rate;
   int adultFee, childFee, totalFee;
   int over3Discount, discountFee;
   while (1) { 
      do {
         printf("輸入平日(1)、晚上(2)或離開(0)：");
         scanf("%d", &rate);
         fflush(stdin);
         if (rate==0)
            exit(0); 
      } while (rate!=1 && rate!=2);
    
      printf("輸入大人數：");
      scanf("%d", &adultNum);
      printf("輸入小孩數：");
      scanf("%d", &childNum);
    
      if (rate==1) {
         adultFee = 268;
         childFee = 120;
      } else {
         adultFee = 368;
         childFee = 150;
      }
      printf("大人 %d 人\n", adultNum);
      printf("小孩 %d 人\n", childNum);

      totalFee = (adultNum*adultFee + childNum*childFee)*1.1; 
      printf("原價 %d 元\n", totalFee); 

      over3Discount = (adultNum+childNum)/3;
      if (over3Discount>0) {
         if (childNum > over3Discount)
            discountFee = over3Discount*childFee*1.1;
         else
            discountFee = ((over3Discount-childNum)*adultFee + childNum*childFee)*1.1;
         totalFee -= discountFee; 
         printf("三人同行方案 折扣 %d 元\n", discountFee);
         printf("三人同行方案 小計 %d 元\n", totalFee); 
      }

      if (childNum+adultNum >= 10) { 
         discountFee = totalFee*0.05;
         totalFee -=  discountFee; 
         printf("十人以上方案 折扣 %d 元\n", discountFee); 
         printf("十人以上方案 小計 %d 元\n", totalFee); 
      } 
      printf("--------------------\n"); 
      printf("總計 %d 元\n\n", totalFee); 
   }
   return 0;
}

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