C语言编程：给一个不多于3位的正整数，要求编程实现（1）求它是几位数？（2）逆序输出各位数字？

#include #include int main(){ int a[3]={0,0,0}; int n,i=0,j; printf("Please Input a number:"); scanf("%d",&n); while(n) { a[i++]=n%10; n/=10; } printf("This number has %d digit(s).\n&q