第三章處理數據

2019-11-06 06:21:08

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第三章處理數據

第一題：用戶輸入身高，單位英寸，轉換成幾英寸幾英尺輸出。并用下劃線提示輸入位置，用const符號常量表示轉換因子。

#include<iostream>using namespace std;int main(void){ const double a = 0.0833; cout << "Enter your height in inch:___" << "/b/b/b"; int height_inch; cin >> height_inch; int feet; double inch; feet = int(height_inch*a); inch = height_inch - feet/a; cout << "/nYour height is : " << feet << " feet ," << inch << " inch. "; getchar(); cin.get(); return 0;}

結果顯示3.1

ps：題目要求用幾英寸幾英寸表示，不是分別表示英尺的整數和小數部分。

第二題：用戶以幾英尺幾英寸形式輸入身高，并以磅數輸入其體重，使用三個變量來存儲，最后計算BMI：體重（千克）除以身高（米）的平方。用符號常量表示各種轉換因子。

#include<iostream>using namespace std;int main(void){ cout << "Your height in form of n foot and m inch." << endl; double height_feet, height_inch; cout << "Please enter the foot value :n = "; cin >> height_feet; cout << "Please enter the inch value :m= "; cin >> height_inch; cout << "Your weight is ___ pound." << "/b/b/b/b/b/b/b/b/b/b"; double pound; cin >> pound; const double a = 12; const double b = 0.0254; const double c = 1 / 2.2; double height_meter,tizhong; cout << "You are : " << height_feet*a + height_inch << " inch. /n"; height_meter = (height_feet*a + height_inch)*b; tizhong = pound*c; cout << "Your BMI value is :" << tizhong /height_meter /height_meter<<endl; getchar(); cin.get(); return 0;}

結果顯示2.1

第三題：用戶以度分秒輸入一個維度，轉換成以度顯示。轉換因子以符號常量表示，并對每個輸入量有一個獨立常量存儲

#include<iostream>using namespace std;int main(void){ cout << "Enter a latitude in degrees, minutes,and seconds "<<endl ; cout << "First,enter the degrees: "; double degrees; cin >> degrees; cout << "Next,enter the minutes of arc: "; double minutes; cin >> minutes; cout << "Finally,enter the seconds of arc: "; double seconds; cin >> seconds; const double trans = 60; cout << degrees << "degrees , " << minutes << " minutes , "; cout<< seconds << " seconds = " << degrees + minutes / trans + seconds / trans / trans <<" degrees."<<endl ; getchar(); cin.get();}

結果顯示3.3

第四題：用戶輸入秒數，以符號常量表示每天有多少小時，多少分，多少秒。并轉換為天，小時，分，秒的形式輸出。

#include<iostream>using namespace std;int main(void){ cout << "Enter the number of seconds: "; long seconds; cin>>seconds; const int minutes = seconds / 60; const int hours = minutes / 60; const int days = hours / 24; cout << seconds << " seconds = " << days << " days "; cout << hours%24<<" hours " ; cout << minutes%60 << " minutes "; cout << seconds%60 << " seconds. /n "; getchar(); cin.get(); return 0;}

結果顯示3.4

ps:注意余數的用法

第五題：要求用戶輸入駕駛里程（英里），和耗油量（加侖），計算1加侖能形式的里程。

#include<iostream>using namespace std;int main(void){ cout << "Enter your car miles: " ; double miles; cin >> miles; cout << "Enter your car gas (gallen): "; double gas; cin >> gas; cout << "A gallen ofgas can run " << double(miles)/gas << " miles." << endl; getchar(); getchar(); return 0;}

結果顯示3.5

第六題：要求用戶輸入每100公里的耗油量（升），轉換為每加侖能行駛多少英里。1加侖為3.875升，100公里為62.14英里。

#include<iostream>using namespace std;int main(void){ cout << "Please enter your car cost with Europe. /n"; cout << "100 km cost gas __ L./b/b/b/b/b"; double gas_L; cin >> gas_L; cout << "Your car's cost is " << 62.14/(gas_L/3.875) << " mpg" << endl; getchar(); getchar(); return 0；}

結果顯示3.6