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）

Question

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;
}

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