单选题
下⾯C++代码⽤于判断输⼊的整数是否为位增数，即从⾸位到个位逐渐增⼤，是则输出1。如123是⼀个位增 数。下⾯横线处应填⼊的是（ )
int N;
int n1,n2;
cin >> N;
_______________
while(N){
n1 = N % 10;
if(n1 >= n2){
cout << 0;
return 1;
}
n2 = n1, N /=10;
}
cout << 1;
cout << endl;
return 0;A.
n2 = N%10
B.
N /= 10
C.
n2 = N/10, N %= 10
D.
n2 = N%10, N /= 10
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