1217=蟠桃记

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 int main()
 4 {
 5     int n,sum,i;
 6     while(scanf("%d",&n)!=EOF&&n!=0)
 7     {
 8         sum=1;
 9         for(i=1; i<n; i++)
10         {
11             sum=sum*2+2;
12         }
13         printf("%d\n",sum);
14     }
15     return 0;
16 }

标签：蟠桃,main,1217,int,sum,while,include
来源： https://www.cnblogs.com/Angfe/p/10490525.html