Chapter04_10_drill_PPPC++

chapter4_10_drill.cpp

#include "../../std_lib_facilities.h"

// 入力された値をm似変換して保持する。最後に一覧を出す。
int main(){
    
    const string unit_cm = "cm";
    const string unit_m = "m";
    const string unit_in = "in";
    const string unit_ft = "ft";
    const double cm_per_m = 100;
    const double cm_per_in = 2.54;
    const double in_per_ft = 12;

    double input = 0;
    string unit = "x";
    double max = 0;
    double min = 0;
    double sum = 0;
    int count = 0;

    vector<double> input_datas;
    
    cout << "値を単位（"<< unit_cm << ", " << unit_m << ", " << unit_in 
        << ", " << unit_ft << "）つきで入力する。「Ctrl-z」を入力したら終了する。\n";

    while(cin >> input){
        if(cin.fail()){
            cout << "input error. \n";
            break;
        }
        
        cin >> unit;

        if(cin.fail()){
            cout << "input error. \n";
            break;
        }

        double tmp = 0;
        if(unit == unit_cm){
            tmp = input;
        }else if(unit == unit_m){
            tmp = input * cm_per_m;
        }else if(unit == unit_in){
            tmp = input * cm_per_in;
        }else if(unit == unit_ft){
            tmp = input * in_per_ft * cm_per_in;
        }else{
            cout << "[ERROR] 値を単位（"<< unit_cm << ", " << unit_m << ", " << unit_in 
                << ", " << unit_ft << "）つきで入力してください。\n";
            return 1;
        }

        // これまでの入力値のうち最大/最小であれば表示
        if(tmp < min){
            cout << " the smallest so far";
            min = tmp;
        }
        if(max < tmp){
            cout << " the largest so far";
            max = tmp;
        }
        cout << '\n';

        // 合計の計上
        sum += tmp / cm_per_m;
        input_datas.push_back(tmp / cm_per_m);

        // 初回の入力を最大/最小の規定値とする。
        count++;
        if(count == 1){
            max = tmp;
            min = tmp;
        }
    }

    cout << "最大値: " << max / cm_per_m << "m" << endl;
    cout << "最小値: " << min / cm_per_m << "m" << endl;
    cout << "合計: " << sum << "m" << endl;
    cout << "入力された値の数: " << count << endl;
    cout << "入力値の一覧: ";
    for(int i = 0; i < input_datas.size(); i++){
        cout << ' ' << input_datas[i] << 'm';
    }
    cout << '\n';

    return 0;
}