Count a character in a string c++

count(str.begin(), str.end(), 'e')

std::string s = "a_b_c";
size_t n = std::count(s.begin(), s.end(), '_'); // n=2

string str_V;
char chr
getline(cin, str_V);
for(i=0; i<=str.length; i++)
{
 	  if(str[i]==chr)
      {
        space++
       }
}

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