水果店水果标价13.8一斤打出来的价格是27.6一斤是因为打出来的价格单位是每公斤的单价。根据查询相关资料信息显示，水果店标价是每斤13.8元，打出来的价格是每公斤27.6元，其中两斤等于一公斤。
#include<stdio.h>
int?main(){
int?i,n,a[4]={30,25,41,102};
char?s[5][10]={"apple","pear","orange","grape","exit"};
for(i=0;i<5;i++)?printf("[%d]?%sn",(i+1)%5,s[i]);
for(i=0;i<5;i++){
scanf("%d",&n);
if(!n){break;}
else?if(n>0&&n<5){printf("price=%.2fn",a[n-1]/10.0);}
}
return?0;
}
[willie@bogon zhidao]$ gcc shuiguo.c -o shuiguo.o
[willie@bogon zhidao]$ ./shuiguo.o
[1] apple
[2] pear
[3] orange
[4] grape
[0] exit
1
price=3.00
2
price=2.50
3
price=4.10
4
price=10.20
5
