下列程序段的执行结果为 Dim A(3,3) For M=1 To 3 For N=1 To 3 If N=M Or N=3-M+1 Then A(M,N)=1 Else A(M,N)=0 End If Next N Next M For M=1 To 3 For N=1 To 3 Print A(M,N) Next N Print Next M
A.1 0 0 0 1 0 0 0 0
B.1 1 1 1 1 1 1 1 1
C.0 0 0 0 0 0 0 0 0
D.1 0 1 0 1 0 1 0 1
参考答案:D
解析: 题中以嵌套For循环为数组A(3,3)赋值,此过程中,如果A(M,N)符合条件"N=M OR N=3-M+1"则此项赋1,否则赋0。以A(1,1)为例,由于M=N=1,故A(1,1)=1。 依次类推: A(1,1)=1 A(2,1)=0 A(3,1)=1 A(1,2)=0 A(2,2)=1 A(3,2)=0 A(1,3)=1 A(2,3)=0 A(3,3)=1