编程输出下列数列的前20项:1,2,5,10,21,42,85,

题目

编程输出下列数列的前20项:1,2,5,10,21,42,85,

答案

#include
using namespace std;
int next(int a)
{
int b;
if (a%2 == 0) b = a*2+1;
else b = a*2;
return b;
}
void main()
{
int a=1;
for (int i = 0;i