如何指針

Question

的數組如何聲明三指針的指針數組聲明三重指針像我有

char *mainmenu[] = {"menu1", "menu2", "menu3"} 

看到的畫面

alt text http://www.freeimagehosting.net/uploads/6988d25305.png

如何連接我的菜單1， 2,3與那些從圖片m1p1 m2p1 ???我只需要語法請幫我...

Answer 1

您可以使用多個*或多個括號組。鑑於你描述的數據結構，我會去
char *mainmenu[X][Y] = {{"m1p1", "m1p2", "m1p3"}, {"m2p1", "m2p2"}}。
請注意，必須定義Y.在C中的多維數組中，必須定義除最外層維以外的所有維的長度（如果使用數據初始化它）。

Answer 2

all[0]是char **類型，並且將匹配的的mainmenu定義，儘管它似乎與陣列中一個終止NULL。

char ***all; 
char *mainmenu[] = {"menu1", "menu2", "menu3", NULL}; 
all[0] = mainmenu; 

Answer 3

它更然後你問，但應該是有幫助的：

/* Functions associated to menu items */ 
void M1P1() { puts("Hey! You selected menu 1 position 1!"); } 
void M1P2() { puts("Hey! You selected menu 1 position 2!"); } 
void M1P3() { puts("Hey! You selected menu 1 position 3!"); } 
void M2P1() { puts("Hey! You selected menu 2 position 1!"); } 
void M2P2() { puts("Hey! You selected menu 2 position 2!"); } 
// ... 

/* structure describing single sub-menu item */ 
typedef struct { 
    char *caption; // item caption 
    void (*action)(); // function associated to this item 
} SubMenuItem; 

/* array of all sub-menu items of menu1 */ 
SubMenuItem sub_menu1[] = { 
    { "m1p1", M1P1 }, 
    { "m1p2", M1P2 }, 
    { "m1p3", M1P3 }, 
}; 
/* array of all sub-menu items of menu2 */ 
SubMenuItem sub_menu2[] = { 
    { "m2p1", M2P1 }, 
    { "m2p2", M2P2 }, 
}; 
// ... 

/* structure describing single main-menu item */ 
typedef struct { 
    char *caption; // item caption 
    SubMenuItem *sub_menus; // array of sub-menu items 
    unsigned sub_menus_count; // number of sub-menu items (length of the array) 
} MenuItem; 

/* array of all main-menu items */ 
MenuItem menu[] = { 
    { "menu1", sub_menu1, sizeof(sub_menu1)/sizeof(sub_menu1[0]) }, 
    { "menu2", sub_menu2, sizeof(sub_menu2)/sizeof(sub_menu2[0]) }, 
    // ... 
}; 

/* number all main-menu items */ 
#define MENU_ITEMS_COUNT (sizeof(menu)/sizeof(menu[0])); 


/* Example - iterationg menu */ 
int i, j; 
for (i = 0; i < MENU_ITEMS_COUNT; i++) { // iterate through main-menu items 
    printf("%d) %s\n", i + 1, menu[i].caption); // print main-menu item index and caption 
    for (j = 0; j < menu[i].sub_menus_count; j++) { // iterate through sub-menu items of current main-menu item 
     printf("\t%d.%d) %s\n", i + 1, j + 1, menu[i].sub_menus[j].caption); // print indices and sub-menu item caption 
    } 
} 

putchar('\n'); 

/* Example - running action associated to menu item */ 
/* To run action associeted to menu 1 position 2 */ 
menu[0].sub_menus[1].action();