Blue Bridge Cup 2020 11th C language group B provincial exercise problem solution-exercise A. Doorplate making

Daily Questions (94)

The 11th Lanqiao Cup C Language Group B Provincial Competition Exercise A: Doorplate Making (5')

This question is very simple

C++ code:

#include<iostream>
using namespace std;

int main()
{
    
    
	int sum = 0;
	int m;
	for(int i = 1; i <= 2020; i++)
	{
    
    
		m = i;
		while(m)
		{
    
    
			if(m % 10 == 2)
			{
    
    
				sum++;
			}
			m /= 10;
		}
	}
	cout << sum << endl;
	return 0;
}

Operation result:

So the answer is:
624

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