来来来，做道题，一起防老年痴呆

 

实现一：

include<stdio.h>
include<stdlib.h>
void exchangeOne(int money){
   int alcol = 0;
   int bottle = 0;
   int lip = 0;     
   while(1) {
   if(money >0){
      money -= 2;
      alcol += 1;
      bottle += 1;
      lip += 1;
    }
    if(bottle >=2){
       wine += 1;
       bottle -=2;
       lip += 1;
    }
    if(lip >= 4 ){
        wine += 1;
        lip -= 4;
        bottle += 1；
     }
     if(money < 0）{
       if((lip < 4) && (bottle < 2){
           break;
        }
     }
   }    
      printf("一共兑换了%d瓶酒
", alcol);
}


int main(){
   int money = 10;
   exchangeOne(money);
} 

According to the first function :exchangeOne，it is obvious that the function is inefficient ,especailly  when the money is  too much , one time two yuan was subtracted from money  which is not  worthwile !

方案二。

#include<stdio.h>
#include<stdlib.h>
void exchangeTwo(int init_alcol){
    int alcol = 0;
    int bottle = 0;
    int lip = 0;
    alcol = init_alcol;
    bottle = init_alcol;
    lip = init_alcol;
    while(1) {
      alcol += bottle/2;  //use bottle to exchange alcol 
      lip += bottle/2; //one bottle of alcole, one  lip .
      bottle =  bottle%2 + bottle/2 ;
      alcol += lip/4;  //use lip to exchange alcol 
      lip = lip%4 + lip/4;
      bottle += lip/4 ;
      if(lip < 4 && bottle < 2 ) {
          break;
      }
    }
    printf(" 一共兑换了%d瓶酒
",alcol);
}
int main(){
      int money = 10;
      exchangeTwo(money/2); //firstly ,use the money to buy alcol  at the price of  two yuan per bottle of alcol 
}