单项选择题
A.inta[][]={1,2,3,4}; B.intx[2][2]={1,2,3,4,5}; C.intx[2][]={1,2,4,6}; D.intm[][3]={1,2,3,4,5,6};
A.a[0] B.a[1] C.a[2] D.a[3]
A.p=NULL B.p=0 C.p=’\0’ D.p!=0