C++ Primer Plus（第6版）第3章 處理數據

復習題

1
一種整型不能滿足編程的需求
2
short shit=80;
unsigned shit=42110;
auto shit=3000000000;
3
沒提供措施，自己小心
4
33L是long類型，33是int類型
5
等價
6
(1) int shit=88;std::cout<<(char)shit;
(2) char shit=88;std::cout< 7
如果浮點型中用於存儲小數的位數>=整型的位數，就不會有捨入誤差。否則，就會有。
查limits.h和float.h，自己解決。
8
74 4 0 4.5 3
9
(1) int shit=(int)x1+(int)x2;
(2) int shit=x1+x2;
10
int float char char32_t double

編程練習

3.1

#include
int main(void)
{
    using namespace std;
    cout<<"輸入你的身高，以英寸為單位\n";
    int inch;
    cin>>inch;
    cout<<"你身高"<

3.2

#include
int main(void)
{
    using namespace std;
    const int inch_per_foot=12;
    const double meter_per_inch=0.0254;
    const double pound_per_kg=2.2;
    cout<<"輸入你的身高，以英尺和英寸的方式\n你身高的英尺數：";
    int foot;
    cin>>foot;
    cout<<"你身高的英寸數：";
    int inch;
    cin>>inch;
    cout<<"輸入你的體重，以磅為單位\n你的體重是：";
    int pound;
    cin>>pound;
    inch=foot*12+inch;
    double meter=inch*meter_per_inch;
    double kg=pound/pound_per_kg;
    double BMI=kg/meter/meter;
    cout<<"你的身高 "<

3.3

#include
int main(void)
{
    using namespace std;
    const int minutes_per_degrees=60;
    const int seconds_per_minutes=60;
    cout<<"Enter a latitude in degrees,minutes,and seconds:\n";
    cout<<"First enter the degrees:";
    int degrees;
    cin>>degrees;
    cout<<"Next,enter the minutes of arc:";
    int minutes;
    cin>>minutes;
    cout<<"Finally,enter the seconds of arc:";
    int seconds;
    cin>>seconds;
    cout<

3.4

#include
int main(void)
{
    using namespace std;
    const int hpd=24;
    const int mph=60;
    const int spm=60;
    const int spd=hpd*mph*spm;
    const int sph=mph*spm;
    cout<<"Enter the number of seconds:";
    long seconds;
    cin>>seconds;
    cout<

3.5

#include
int main(void)
{
    using namespace std;
    cout<<"Enter the world's population:";
    long long world;
    cin>>world;
    cout<<"Enter the population of the US:";
    long long US;
    cin>>US;
    cout<<"The population of the US is "<<(double)US/world*100<<"% of the world population.\n";
    return 0;
}


3.6

#include
int main(void)
{
    using namespace std;
    const double mpk=0.6214;
    const double lpg=3.785;
    cout<<"輸入驅車裡程(英裡) ";
    double mile;
    cin>>mile;
    cout<<"輸入耗油量(加侖) ";
    double gallon;
    cin>>gallon;
    cout<<"汽車耗油量為"<

3.7

#include
int main(void)
{
    using namespace std;
    const double mpk=0.6214;
    const double lpg=3.785;
    cout<<"輸入每百公裡耗油量(升) ";
    double liter;
    cin>>liter;
    double gallon;
    gallon=liter/lpg;
    double mile;
    mile=mpk*100;
    cout<<"每百公裡耗油量為"<