在字符串中查找指定子串出现的次数+在字符串中查找指定字符出现的次数

//在字符串中查找指定子串出现的次数

#include 
#include 
using namespace std;
int main() {
  string str ;
  getline(cin,str);
  string target;
  getline(cin,target);

  int cnt = 0;
  int pos = 0;//或者size_t pos=0;
  while ((pos = str.find(target, pos)) != -1) { 
                        //或者将-1改为string::npos
    ++cnt;
    ++pos;
  }

cout << "The target string appears " << cnt << " times." << endl;

  return 0;
}

//在字符串中查找指定字符出现的次数

#include 
#include 
#include 
using namespace std;
int main() {
  string str;
  getline(cin,str);
  char target;
  cin>>target;

  int cnt = count(str.begin(), str.end(), target);

  cout << "The target character appears " << cnt << " times." << std::endl;

  return 0;
}