Doorplate making C language

House number making

Xiaolan wants to make house numbers for the residents in a street .

This street has 2020 Residents , House number from 1 To 2020 Number .

Xiaolan's method of making house number is to make it first 0 To 9 These numeric characters , Finally, paste the characters on the doorplate as needed , For example, the house number 1017 You need to paste the characters in turn 1、0、1、7, That is to say 1 Characters 0,2 Characters 1,1 Characters 7.

Please make all the 1 To 2020 House number , How many characters are needed in total 2？

Code ：

#include<stdio.h> 
int main()
{
    int i,j,temp,count=0,a;
    for(i=1;i<=2020;i++)
    {
        temp=i;
        while(temp!=0)
        {
            a=temp%10;  // Take the last digit of the number  
            if(a==2)
                count++;
            temp=temp/10;  // Remove the last digit of the number  
        }
    }
    printf("%d",count);
    return 0;
}