Count the number of character

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

int character (string s)
{
int charnum=s.size();
for(char i=0; i<s.size(); i++)
{
if(s.at(i)== ' ')
{
charnum--;
}
if(s.at(i)== '.')
  {
charnum--;
}
}
cout<<endl<<"Enter string has "<<charnum <<" Characters:"<<endl;
}


int main()
{
string s;
char i;
cout<<"Please type in a string: " ;
getline(cin,s);
character(s);
return 0;
}