C Programming

#include <stdio.h>
void main()
{
　int b = 1;
　printf( "%d %d\n", b * 2, b << 1 );
　printf( "%d %d\n", b * 4, b << 2 );
　printf( "%d %d\n", b * 8, b << 3 );
　printf( "%d %d\n", b * 16, b << 4 );

　int a = 16;
　printf( "%d %d\n", a / 2, a >> 1 );
　printf( "%d %d\n", a / 4, a >> 2 );
　printf( "%d %d\n", a / 8, a >> 3 );
　printf( "%d %d\n", a / 16, a >> 4 );
}

2 2
4 4
8 8
16 16

8 8
4 4
2 2
1 1