[C++知识库]c++ 美丽的2

code

#include <iostream>
using namespace std;

int main()
{
	int n, i;
	int count = 0;

	for (n = 1; n <= 2020; n++) {
		i = n;
		while (i) {
			if (i % 10 == 2) {
				count++;
				break;
			}
			i /= 10;	
		}
	}
	cout << count;
	return 0;
}

?count=563