查询某个字符在字符串中出现的次数

查询某个字符在字符串中出现的次数，可用于查询string,char类型的查询，然后用类模板实现了

#include "iostream"
using namespace std;

//字符串查询某个字符的出现的次数
int count(const string &s, char c)
{
    int n = 0;
    string::const_iterator i = find(s.begin(), s.end(), c);
    while (i != s.end())
    {
        ++n;
        i = find(i + 1, s.end(), c);
    }
    return n;
}

//类模板的实例化查询模板类出现的次数
template<class C, class T>int Count(const C &v, T val)
{
    typename C::const_iterator i = find(v.begin(), v.end(), val);
    
    int n = 0;
    while (i != v.end())
    {
        ++n;
        ++i;
        i = find(i, v.end(), val);
        
    }
    return n;
}


void main()
{
    const string str = "abcabcdfsafascfaf";
    char c = 'c';
    int n = Count(str, c);
    int b = count(str, c);
    cout << "字符串里面出现c的个数是：" << n << endl;
    
    
    system("pause");
}