[求助]c++编程试题
把下列数列延长到第50项:1,2,5,10,21,42,85,170,。。。。
# include <iostream.h>
void main()
{ int n=50,b,a;
if(n%2!=0)
for(n=3;n<=49;n+2)
int a=1;
a=(4*a)+1;cout<<a<<endl;
b=2*a;
cout<<b<<endl;
}