第 28 題 - 解答

#include <stdio.h>

int main()

   int category, number, power;

   double bill;

   printf("請輸入用電類別(1~3)：");

   scanf("%d",&category);

   printf("請輸入使用度數：");

   scanf("%d",&number);

   switch(category)

      case 1:

         if(number<=100)

            bill=number*2.4;

         else if(number<=300)

            bill=100*2.4+(number-100)*3.1;

         else

            bill=100*2.4+200*3.1+(number-300)*4.1;

         break;

      case 2:

         printf("請輸入契約馬力：");

         scanf("%d",&power);

         bill=power*138+number*1.83;

         break;

      case 3:

         if(number<=300)

            bill=number*5.9;

         else

            bill=300*5.9+(number-300)*6.7;

   printf("電費=%f元\n",bill);

   return 0;

考試版本

#include <stdio.h>

int main()

   int category, number, power;

   double bill;

   scanf("%d",&category);

   scanf("%d",&number);

   switch(category)

      case 1:

         if(number<=100)

            bill=number*2.4;

         else if(number<=300)

            bill=100*2.4+(number-100)*3.1;

         else

            bill=100*2.4+200*3.1+(number-300)*4.1;

         break;

      case 2:

         scanf("%d",&power);

         bill=power*138+number*1.83;

         break;

      case 3:

         if(number<=300)

            bill=number*5.9;

         else

            bill=300*5.9+(number-300)*6.7;

   printf("%f\n",bill);

   return 0;