# include & ltwindows.h & gt
//\n 1。 Increase? 2. query? 3. Delete? 4. Exit \ n ");
//Declare a function
Invalid? addnd()；
Invalid? search nd()；
Invalid? printnd()；
Invalid? charund()；
//Including? Enumeration type? Branch switch
enum？ Mmenu{/* Define an enumeration type named Mmenu?
Constants can have certain meanings (such as implementation menu) */
Addn= 1,//The default value is 0, which is defined as after 1? Subsequent members are also automatically converted (sorted).
searchn，
printn，
quitn
};
Invalid? main(){
enum？ Menu? Input;
while( 1){
Printf ("Menu \n 1。 Supplement? 2. query? 3. print? 4. Exit \ n ");
Scanf("%d ",& input);
Sleep (500);
System ("CLS");
What happened in switch(input){//case? Can only be an integer or a character constant.
Case? Addn:printf (" 1 is selected. add \ n ")； addnd()； Break;
Case? Searchn:printf ("2。 Query the selected \ n "); search nd()； Break;
Case? Printn:printf ("3。 Print the selection \ n "); printnd()； Break;
Case? Quitn:printf ("4。 Exit the selected \ n "); Exit (0); Break;
Default? : printf ("is not in the option, please re-enter! \ n ")； Break; }
};
}
Invalid? Addnd(){// add
Printf("// Please customize the addnd () function code//\ n ");
}
Invalid? searchnd(){
Printf("// Please customize the searchnd () function code//\ n ");
}
Invalid? Printnd(){// print
Printf("// Please customize the code of printnd () function//\ n "); ?
}
Invalid? charund(){
Printf("// Please customize the charund function code//\ n "); ?
}