计算某个整数含有几位数
#include <iostream>
using namespace std;
int main()
{
int n,c;
cin >> n;
c = log10(n) + 1;
cout << c;
}
#include <iostream>
using namespace std;
int main()
{
int n,c;
cin >> n;
c = log10(n) + 1;
cout << c;
}