7.4 函数和二维数组

不念不忘少年蓝@ 2022-04-16 04:59 65阅读 0赞

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7.5 函数和c-风格字符串

C-风格字符串由一系列字符组成，以空值字符结尾。

将字符串作为参数时意味着传递的是地址，但可以使用const来禁止对字符串参数进行修改。

7.5.1 将C-风格字符串作为参数的函数

假设要将字符串作为参数传递给函数，则表示字符串的方式有三种：

char数组；

用引号括起的字符串常量（也称字符串字面值）；

被设置为字符串的地址的char指针。

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#include <iostream>
    usigned int c_in str{const char *str,char ch};
    int main()
    {
        using namespace std;
        char mmm[15]="minimum"; //string in an array
    //some systems require preceding char with static to enable array initialization
        char *wail="ululate";  //wail points-to string
        unsigned int ms=c_in_str(mmm,'m');
        unsigned int us =c_in_str(wail,'u');
        cout<<ms<<"m characters in "<<mmm<<endl;
        cout<<us<<"u characters in "<<wail<<endl;
        return 0;
    }
    //this function counts the number of ch characters in the string atr
    unsigned int c_in_str(const char *str.char ch)
    {
        unsigned int count=0;
        while (*str)  //quit when *str is'/0'
    { 
    if (*str == ch)
       count ++;
     str++;  //move pointer to next char
    }
    return count;
    }

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travel_time sum(travel_time t1,travel_time t2)
    {
      travel_time toal;
      total.mins=(t1.mins_t2.mins)%Mins_per_hr;
      total.hours=t1.hours_t2.hours+(t1.mins_t2.mins)/Mins_per_hr;
      return total;
    }
    void show_time(travel_time t){
       using namespace std;
       cout<<t.hours<<"hours."<<t.mins<<"minutes\n";
    }

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#include <iostream>
    #include<cmath>
    
    //structure templates
    struct polar
    {
      double distance; //distance from origin
      double angle;  //direcction from origin
    };
    struct rect
    {
       double x;  //horizontal distance from origin
       double y;   //vertical distance from origin
    };
    //prototypes
    void rect_to_plar(const rect *pxy,polar *pda);
    void show_polar(const polar *pda);
    
    int main()
    {
      using namespace std;
      rect rpace;
      polar pplace;
      cout<<"Enter the x and y values:"
      while (cin >> rplace.x>>rplace.y)
    { rect_to polar(&rplace,&pplace); //pass addresses
      show_polar(&applace); //pass addresses
       cout<<"Next two number (q to quit):"
    }
    cout<<"Done.\n";
    return 0;
    }
    //show polar coordinates,corverting angle to degrees
    void show_polar (const polar *pda)
    {
      using namespace std;
      const double Rad_to_deg=57.29577951;
      cout<<"distance ="<<pda->distance;
      cout<<",angle="<<plda->angle *Rad_to_deg;
      cout<<"degrees\n";
    }
    //convert rectangular to polar coordinates
    void rect_to_polar(const rect *pxy,polar *pda)
    {
     using namespace std;
     pda-distance=sqrt(pxy->x *pxy->x + pxy->y *pxy->y);
     pda-angle=atan2(pxy->y,pxy->x);
    }

7.7函数和string对象

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7.8 函数和array对象

类对象是基于结构的，因此结构编程方面的有些考虑因素也适用于类。例如，可按值将对象传递给函数，在这种情况下，函数处理的是原始对象的副本。另外，也可将传递指向对象的指针，这让函数能够操作原始对象。

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#include <iostream>
    #include <array>
    #include <string>
    //constant data
    const int Seasons =2;
    const std::array<std::string,Season>Snames={"Spring","Summer","Fall","Winter"}；
    
    //function to modify array object
    void fill(std::array<double,Seasons> *pa);
    //function that uses array object without modifying it
    void show (std::array<double,Seasons> da);
    int main()
    {
      std::array<double,Seasons> expenses;
      fill(&expenses);
      show(expenses);
      return 0;
    }
    void fill (std:;array<double,Seasons> *pa)
    {
      using namepace std;
      for (int i=0;i<Seasons;i++)
    {
      cout<<"enter"<<Sname[i]<<"expenses:";
      cin>>(*pa)[i];
    }
    }
    
    void show(std::array<double,Seasons> da)
    {
       using namespace std;
       double total=0.0;
       cout<,"\nEXPENSES\n";
       for (int i-=0;i<Seasons;i++)
       {
          cout<<Sname[i]<<":$"<<da[i]<<endl;
          total +=da[i];
    }
    cout <<"Total Expenses:$"<<total<<endl;
    }

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7.9 递归

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7.10函数指针

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#include <iostream>
    //various notations,same signatures
    const double *f1(const double ar[],int n);
    const double *f2(const double [],int);
    const double *f3(const double *,int);
    
    
    
    int main(){
       using namespace std;
       double av[3]=[1112.3,1542.6,2227.9);
       //pointer to a function
       const double *(*p1)(const double *,int)=f1;
       auto p2=f2;

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