6_9.cpp

C程序参考,简单易懂,是初学者不可少的参考资料

#include<stdio.h>
main()
 {
    int day,m,n;
    day=9;
    n=1;
    while(day>0)
    {
        m=(n+1)*2;
        n=m;
        day--;
    }
    printf("total number=%d\n",m);
 }