在C++/汇编中统计字符频率(直方图)

#include <iostream>
#include <fstream>
#include <map>

void drawHistogram(const std::map<char, int>& frequencyMap) {
    int maxFrequency = 0;
    for (const auto& pair : frequencyMap) {
        if (pair.second > maxFrequency) {
            maxFrequency = pair.second;
        }
    }

    for (const auto& pair : frequencyMap) {
        std::cout << pair.first << " | ";
        for (int i = 0; i < pair.second; i++) {
            std::cout << "*";
        }
        std::cout << std::endl;
    }
}

int main() {
    std::ifstream file("input.txt");
    if (!file) {
        std::cout << "Failed to open file." << std::endl;
        return 1;
    }

    std::map<char, int> frequencyMap;
    char c;
    while (file.get(c)) {
        if (isalpha(c)) {
            frequencyMap[c]++;
        }
    }

    drawHistogram(frequencyMap);

    return 0;
}