单选题：以下程序的执行结果是 ____

以下程序的执行结果是( )

int main()
{
int num = 0;
while( num <= 2 )
{
num++;
printf( "%d,",num );
}
return 0;
}





A.0,1,2


B.1,2,3,


C.1,2,3,4,


D.1,2,




answer：B