Question

用c++统计一个英文句子中字母个数 在主程序中输入输出（用类与对象）

最好在以下的基础上添加类与对象
#include<iostream>
#include <string>
using namespace std ;
int main()
{
string Str;
char ch;
int i=0,cnt=0;
cout<<"input str:";
getline(cin, Str);
for(i=0;i<Str.length();i++)
{
if(Str[i]>='a'&&Str[i]<='z'||Str[i]>='A'&&Str[i]<='Z')
cnt++;
}
cout<<"str="<<Str<<endl;
cout<<"字母个数："<<cnt<<endl;
system("pause");
return 0;
}

Answer 1

#include<iostream>
#include <string>
using namespace std;
class Mystring
{
private:
    string str;
    int letterNum;
public:
    Mystring()
    {
        str = "";
        letterNum = 0;
    }
    Mystring(string s)
    {
        str = s;
        int i=0, cnt=0;
        for(i=0; i<str.length(); i++)
        {
            if(str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z')
            cnt++;
        }
        letterNum = cnt;
    }
    string getStr()
    {
        return str;
    }
    int getNum()
    {
        return letterNum;
    }
};
int main()
{
    string str;
       
    cout<<"input str:";
    getline(cin, str);
       
    Mystring ms(str);
    cout << "str=" << ms.getStr() << endl;
    cout << "字母个数：" << ms.getNum() << endl;
    system("pause");
    return 0;
}