명품 c++ programming 4장 10번

#include <iostream>
#include <string>
using namespace std;
 
class Histogram
{
    string sentence;
    int isAlphaCount = 0;
    int AlphaCount[26] = { 0 };
public:
    Histogram(string sentence) { this->sentence = sentence; this->sentence += '\n';
    }
    void put(string sentence);
    void putc(char c);
    void print();
 
};
 
void Histogram::put(string sentence)
{
    this->sentence += sentence;
}
 
void Histogram::putc(char c)
{
    this->sentence += c;
}
 
void Histogram::print()
{
    cout << sentence << endl << endl;
 
    for (int i = 0; i < sentence.length(); i++)
    {
        if (isalpha(sentence.at(i)))
        {
            isAlphaCount++;
            if (65 <= sentence.at(i) && sentence.at(i) <= 90)
            {
                sentence.at(i) -= 32;
            }
            AlphaCount[sentence.at(i) - 97]++;
        }
    }
    cout << "총 알파벳 수 " << isAlphaCount << endl << endl;
    
    for (int i = 0; i < 26; i++)
    {
        cout << (char)(i + 97) << '(' << AlphaCount[i] << ")   ";
        for (int j = 0; j < AlphaCount[i]; j++)
            cout << '*';
        cout << endl;
    }
}
 
int main()
{
    Histogram elvisHisto("Wise men say, only fools ruch in But I can't help, ");
    elvisHisto.put("falling in love with you");
    elvisHisto.putc('-');
    elvisHisto.put("Elvis Presley");
    elvisHisto.print();
}