CPP_Basic_Code_P8.1-PP8.8.7
// The Notes Created by Z-Tech on 2017/2/17.
// All Codes Boot on 《C++ Primer Plus》V6.0
// OS：MacOS 10.12.4
// Translater：clang/llvm8.0.0 &g++4.2.1
// Editer：iTerm 2&Sublime text 3
// IDE: Xcode8.2.1&Clion2017.1
//P8.1
#include
inline double square(double x) {return x*x;}//注意内联函数结尾没有;
int main()
{
using namespace std;
double a,b;
double c=13.0;
a=square(5.0);
b=square(4.5+7.5);
cout<<"a= "<
int main()
{
using namespace std;
int rats=101;
int& rodents=rats;//引用rodents
cout<<"rats= "<
double cube(double a);
double refcube(double &ra);//引用式参数
int main()
{
using namespace std;
double x=3.0;
cout<
#include
struct free_throws
{
std::string name;
int made;
int attempts;
float percent;
};
void display(const free_throws& ft);
void set_pc(free_throws& ft);
free_throws& accumulate(free_throws& target,const free_throws& source);
int main()
{
free_throws one {"Ifelsa Branch",13,14};
free_throws two {"Andor Knots",10,16};
free_throws three {"Minnie Max",7,9};
free_throws four {"Whily Looper",5,9};
free_throws five {"Long Long",6,14};
free_throws team {"Throwgoods",0,0};
free_throws dup;
set_pc(one);
display(one);
accumulate(team,one);
display(team);
display(accumulate(team,two));
accumulate(accumulate(team,three),four);
display(team);
dup=accumulate(team,five);
std::cout<<"Displaying team:\n";
display(team);
std::cout<<"Displaying dup after assignment:\n";
display(dup);
set_pc(four);
accumulate(dup,five)=four;//此类语句应该避免，最后dup仍为four
std::cout<<"Displaying dup after ill-advised assignment:\n";
display(dup);
return 0;
}
void display(const free_throws& ft)
{
using namespace std;
cout<<"Name: "<
#include //非必需
using namespace std;
string version1(const string& s1,const string& s2);
const string& version2(string& s1,const string& s2);//单边效应
const string& version3(string& s1,const string& s2);//糟糕的设计，虽clion中未崩溃
int main()
{
string input;
string copy;
string result;
cout<<"Enter a string: ";
getline(cin,input);
copy=input;
cout<<"Your string as entered: "<
#include
//#include //非必需
using namespace std;
void file_it(ostream& os,double fo,const double fe[],int n);
const int LIMIT=5;
int main()
{
ofstream fout;
const char* fn="ep-data.txt";//字面字符串赋值必需使用const
fout.open(fn);
if (!fout.is_open())//检测打开是否正常
{
cout<<"Can't open"<>objective;
double eps[LIMIT];
cout<<"Enter the focal length,in mm,of "<>eps[i];
}
file_it(fout,objective,eps,LIMIT);
file_it(cout,objective,eps,LIMIT);
cout<<"Done.\n";
return 0;
}
void file_it(ostream& os,double fo,const double fe[],int n)
{
ios_base::fmtflags initial;//声明格式化存储信息initial，存储格式化设置
initial=os.setf(ios_base::fixed);//使用定点表示法模式
os.precision(0);//定点模式下有效，指定小数位数设置
os<<"Focal length of objective: "<
const int ArSize=80;
char* left(const char*str,int n=1);
int main()
{
using namespace std;
char sample[ArSize];
cout<<"Enter a string:\n";
cin.get(sample,ArSize);
char* ps=left(sample,4);
cout<
unsigned long left(unsigned long num, unsigned ct);
char* left(const char* str,int n=1);
int main()
{
using namespace std;
const char* trip="Hawaii!!";
unsigned long n=12345678;
int i;
char* temp;
for (i=1;i<10;i++)
{
cout<ct)
{
ct=digits-ct;
while (ct--)
num/=10;//删除ct位后就是所要的num
return num;
}
else
return num;
}
char* left(const char* str,int n)
{
if (n<0)
n=0;
char*p=new char[n+1];
int i;
for (i=0;i
template //or use
void Swap(T& a,T& b);//引用式模板交换函数
int main()
{
using namespace std;
int i=10;
int j=20;
cout<<"i,j= "<//定义前面也必须带这个模板声明
void Swap(T& a,T& b)
{
T temp;
temp=a;
a=b;
b=temp;
}
//P8.12
#include
template
void Swap(T& a,T& b);//指向引用
template
void Swap(T* a,T* b,int n);//指向指针
void show(int a[]);
const int Lim=8;
int main()
{
using namespace std;
int i=10,j=20;
cout<<"i,j= "<
void Swap(T& a,T& b)
{
T temp;
temp=a;
a=b;
b=temp;
}
template
void Swap(T* a,T* b,int n)
{
T temp;
for (int i=0;i
template
void Swap(T& a,T& b);
struct job
{
char name[40];
double salary;
int floor;
};
template <> void Swap(job& j1,job& j2);//显式具体化
void show(job& j);
int main()
{
using namespace std;
cout.precision(2);
cout.setf(ios::fixed,ios::floatfield);
int i=10,j=20;
cout<<"i,j= "<
void Swap(T& a,T& b)
{
T temp;
temp=a;
a=b;
b=temp;
}
template <> void Swap(job& j1,job& j2)
{
double t1;
int t2;
t1=j1.salary;
j1.salary=j2.salary;
j2.salary=t1;
t2=j1.floor;
j1.floor=j2.floor;
j2.floor=t2;
}
void show(job& j)
{
using namespace std;
cout<
template
void ShowArray(T arr[],int n);//接收指针
template
void ShowArray(T* arr[],int n);//接收指向指针的指针
struct debts
{
char name[50];
double amount;
};
int main()
{
using namespace std;
int thing[6] {13,31,103,301,310,130};
debts mr_E[3]
{
{"Ima Wolfe",2400.0},
{"Ura Foxe",1300.0},
{"Iby Stout",1800.0}
};
double* pd[3];//指针数组
for (int i=0;i<3;i++)
pd[i]=&mr_E[i].amount;//全部指向结构体中的double
cout<<"Listing Mr.E's counts of thing:\n";
ShowArray(thing,6);//thing是数组名，是一个指向第一个元素的指针
cout<<"Listing Mr.E's debts:\n";
ShowArray(pd,3);//pd是指针数组的数组名，是指向第一个指针的指针
return 0;
}
template
void ShowArray(T arr[],int n)
{
using namespace std;
cout<<"template A\n";
for (int i=0;i
void ShowArray(T* arr[],int n)
{
using namespace std;
cout<<"template B\n";
for (int i=0;i
template
T lesser(T a,T b)//返回值较小的那个
{
return a(m,n)<提示选择模板函数
cout<(x,y)<
void show(const char* str,int n=0);
int main()
{
using namespace std;
const char* strr="Hello,word.\n";
show(strr);
int number;
cout<<"Enter a number: ";
cin>>number;
show(strr,number);
cout<<"Done.\n";
return 0;
}
void show(const char* str,int n)
{
using namespace std;
if (n<=0)
n=1;
for (int i=0;i
struct CandyBar
{
char Brandname[30];
double Weight;
int Calaries;
};
void fill_struct(CandyBar& strc,const char* nm="Millennium Munch",double wt=2.85,int clr=350);
void show_struct(CandyBar& strc);
int main()
{
using namespace std;
CandyBar* xv=new CandyBar;
cout<<"Please enter Brandname: ";
cin>>xv->Brandname;
cout<<"\nEnter Weight of product: ";
cin>>xv->Weight;
cout<<"\nEnter Calaries of product: ";
cin>>xv->Calaries;
show_struct(*xv);
fill_struct(*xv);
show_struct(*xv);
fill_struct(*xv,"快说你是不是傻",9.99,9999);
show_struct(*xv);
delete xv;
return 0;
}
void fill_struct(CandyBar& strc,const char* nm,double wt,int clr)
{
strcpy(strc.Brandname,nm);
strc.Weight=wt;
strc.Calaries=clr;
}
void show_struct(CandyBar& strc)
{
using namespace std;
cout<<"BrandName: "<
//#include
//#include
void fuct_up(std::string& str);
int main()
{
using namespace std;
string something;
cout<<"Enter a string (q to quit): ";
while (getline(cin,something)&&something!="q"&&something!="Q")
{
fuct_up(something);
cout<
#include
using namespace std;
struct stringy
{
char* str;
int ct;
};
void set(stringy& strct,char* str);
void show(const char* str,int num=1);
void show(const stringy& strct,int num=1);
int main()
{
stringy beany;
char testing[]="Reality isn't what it used to be.";
set(beany,testing);
show(beany);
show(beany,2);
testing[0]='D';//直接数组式操作调整字符串内容
testing[1]='u';
show(testing);
show(testing,3);
show("Done!");
delete beany.str;//释放内存
return 0;
}
void set(stringy& strct,char* str)
{
char* xvr=new char[strlen(str)+1];
strct.str=xvr;//使结构成员指向new出的指针
strcpy(strct.str,str);//复制字符串内容
strct.ct=strlen(str);
}
void show(const char* str,int num)
{
using namespace std;
for (int i=0;i
//#include
template
T maxn(T arry[],int n);
template <> const char* maxn(const char* arry[],int n);//字面值的字符串务必使用const
int main()
{
using namespace std;
int arr_int[6]{1,3,23,4,11,66};
double arr_db[4]{22.4,23.6,74.8,9.9};
cout<<"Now using maxn():\n";
cout<<"Array_int_Max: "<
T maxn(T arry[],int n)
{
T Max=arry[0];
for (int i=0;i const char* maxn(const char* arry[],int n)//具体化
{
const char* xv=arry[0];
for (int i=1;istrlen(xv))
xv=arry[i];
}
return xv;//返回指针
}
//PP8.8.7
#include
template
void SumArray(T arr[],int n);//接收指针
template
void SumArray(T* arr[],int n);//接收指向指针的指针
struct debts
{
char name[50];
double amount;
};
int main()
{
using namespace std;
int thing[6] {13,31,103,301,310,130};
debts mr_E[3]
{
{"Ima Wolfe",2400.0},
{"Ura Foxe",1300.0},
{"Iby Stout",1800.0}
};
double* pd[3];//指针数组
for (int i=0;i<3;i++)
pd[i]=&mr_E[i].amount;//全部指向结构体中的double
cout<<"Listing Mr.E's counts of thing:\n";
SumArray(thing,6);//thing是数组名，是一个指向第一个元素的指针
cout<<"Listing Mr.E's debts:\n";
SumArray(pd,3);//pd是指针数组的数组名，是指向第一个指针的指针
return 0;
}
template
void SumArray(T arr[],int n)
{
using namespace std;
cout<<"Result_Sum: \n";
int count=0;
for (int i=0;i
void SumArray(T* arr[],int n)
{
using namespace std;
cout<<"Result_Sum: \n";
int count=0;
for (int i=0;i
