count a character in a string c 2b 2b

1count(str.begin(), str.end(), 'e')

1std::string s = "a_b_c";
2size_t n = std::count(s.begin(), s.end(), '_'); // n=2

1string str_V;
2char chr
3getline(cin, str_V);
4for(i=0; i<=str.length; i++)
5{
6 	  if(str[i]==chr)
7      {
8        space++
9       }
10}