奋战杭电ACM（DAY12）1018

Big Number

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
int n,m;
double sum,digit;
while(cin >> n){
while(n>=1)
{
cin >> m;
sum=0;
for(int i=1; i<=m; i++)
{
digit=log10((double)i);//long double/double/float log10(long double/double/float)
sum += digit;
}
n-=1;
cout << (int)(sum+1) << endl;
}
}

return 0;
}