指向数组的指针用法总结

part1:指向一维char数组

char ch[40]="helloworld!";

#1：pch3是一个（char*)指针，它指向一个char, 即指向ch[40]的第一个元素ch[0]

    char* pch3 = &ch[0];

    cout << "pch3: "<< pch3 << " *pch3: " << *pch3 << "*(pch3+1): " << *(pch3+1) << endl;

    cout << "pch3[0]:" << pch3[0] << " pch3[1] " << pch3[1]<< endl;  

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#2：pch是一个（char*)指针，它指向一个char, 即指向ch[40]的第一个元素ch[0]

    char* pch = ch;

    cout << (int*) pch <<"  " << &ch <<"  " << (int* )&ch[0]<< endl; 

    cout << pch << endl << " *pch : " << *pch << endl << " *( pch + 1 ) : " << *(pch + 1) << " pch[0]: "       << pch[0] << " pch[1]: " << pch[1] << endl ;

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#3：pch1是一个char(*)[40]指针，它指向一个含有40个char元素的数组，pch1+1跳过了40*sizeof(char)的长度

char (*pch1)[40] = &ch; 

cout <<"pch1 + 1 : " << pch1+1 << " *( pch1 + 1 ) : " << * (pch1+1) << endl; //*(pch1+1)显示乱码

cout << "pch1[0] " << pch1[0] << " pch1[1]: " << pch1[1] << endl; 

//输出：pch1[0] hello world! pch1[1]: 乱码

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part2:指向二维char数组

    char ch2[3][40]={

        "hello world1",

        "hello world2",

        "hello world3"

    };

#1:ppch2是一个指向char的指针  

    char* ppch2 = ch2[0];

    cout << "*ppch2: "<< *ppch2 << endl;  //输出的是'h'

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#2:ppch3是一个指向char[40]的指针

    char(* ppch3)[40] = ch2;

    cout << "*ppch3: "<< *ppch3 << endl;  //*ppch3:hello world1

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#3:ppch4是指向char[3][40]的指针

    char(* ppch4)[3][40] = &ch2;

    cout << "*ppch4: "<< *ppch4 << endl;

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part3:int一维数组的指针和char一维数组的指针用法相同

    intintarray[20]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};

    int* pint = intarray ;

    cout << intarray[4] <<"  " << pint[4] << endl;

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part4:结构体数组指针

    const int SLEN = 30;

    struct student{

        char fullname[SLEN];

        char hobby[SLEN];

        int ooplevel;

    };

    student pa[3]={

        {"MarkMa","basketball",1},

        {"LitterLi","swimming",0},

        {"YelloYe","piano",2}

    }; 

#1：指针指向第一个元素

    student* pstu1 = &pa[0];

    cout << pstu1[0].fullname<< endl;

    cout << pstu1->fullname<< endl;

    cout <<(*(pstu1+2)).fullname << endl;

    cout << pstu1[2].fullname<< endl;

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#2：指针指向第一个元素

    student* pstu = pa;

    cout << pstu[0].fullname<< endl;

    cout << pstu->fullname<< endl;

    cout << (*(pstu+2)).fullname<< endl;

    cout << pstu[2].fullname<< endl;

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#3：指向整个结构体数组

    student(* pstu3)[3] = &pa;