[C++知识库]C++ Premier Plus丨编程练习答案丨第三章

C++ Premier Plus丨编程练习答案丨第三章

#include<iostream>
using namespace std;
int main(){
	//3_1
	/*const double inchToFoot = 12;
	int tall;
	cout<<"input your tall(int)(inch) "<<"___\b\b\b";
	cin>>tall;
	cout<<endl;
	cout<<"your tall(foot) is "<<tall/inchToFoot<<endl;*/
	//3_2
	/*const double footToInch = 12;
	const double inchToM = 0.0254;
	const double pondToKg = 2.2;
	int foot = 0;
	int inch = 0;
	double m = 0;
	double pond = 0;
	double kg = 0;
	double bmi = 0;
	cout<<"input your foot and inch"<<endl;
	cout<<"foot ";
	cin>>foot;
	cout<<" inch ";
	cin>>inch;
	cout<<endl;
	cout<<"input your pond ";
	cin>>pond;
	cout<<endl;
	inch = inch+foot*footToInch;
	cout<<"your inch is "<<inch<<endl;
	m = inch*inchToM;
	kg = pond*pondToKg;
	bmi = kg/m/m;
	cout<<"your bmi is "<<bmi<<endl;*/
	//3_3
	/*cout<<"Enter degree, minute, second"<<endl;
	const double dToM = 60;
	const double mToS = 60;
	int degree;
	int minute;
	int second;
	cout<<"Degree is ";
	cin>>degree;
	//cout<<endl;//cin输入的是数和1个回车，因为有回显，相当于自带1个回车
	cout<<"Minute is ";
	cin>>minute;
	//cout<<endl;
	cout<<"Second is ";
	cin>>second;
	//cout<<endl;
	cout<<degree<<" Degree, "<<minute<<" Minute, "<<second<<" Second, "<<" = "<<degree + minute/dToM + second/mToS/dToM<<" degrees."<<endl;*/
	//3_4
	/*const int hourInDay = 24;
	const int minInHour = 60;
	const int secInMin = 60;
	long second = 0;
	int day = 0;
	int hour = 0;
	int min = 0;
	cout<<"Enter Second";
	cin>>second;
	day = second/(hourInDay*minInHour*secInMin);
	hour = (second%(hourInDay*minInHour*secInMin))/(minInHour*secInMin);
	min = (second%(hourInDay*minInHour*secInMin))%(minInHour*secInMin)/secInMin;
	second = (second%(hourInDay*minInHour*secInMin))%(minInHour*secInMin)%secInMin;
	cout<<"day = "<<day<<" hour = "<<hour<<" min = "<<min<<" sec = "<<second;*/
	//3_5
	/*long long worPo;
	long long amPo;
	double ratio = 0;
	cout<<"Enter world's population";
	cin>>worPo;
	cout<<"Enter USA's population";
	cin>>amPo;
	ratio = (double)amPo/worPo;
	cout<<"The USA's po is "<<ratio*100<< "%"<<"of the world po"<<endl;*/
	//3_6
	/*int distance = 0;
	int gas = 0;
	//int unitDis = 0;
	cout<<"Enter distance ";
	cin>>distance;
	cout<<"Enter gas ";
	cin>>gas;
	cout<<"you drive "<<distance/(double)gas<<" distance per gas"<<endl;*/
	//3_7
	//懒得搞了

	return 0;
}