a simple question, but might not that easy

[djwinter]

for some reason, in my program can not use malloc and new(becuase in a very special system, if the momory free or delet two times, system will freeze)

I use char a[20] instead
i wondering how to clear all the element after using a[]?

[sinall]

char a[20] is in stack,so u have no need clear it by yourself.

[Jokar]

I use char a[20] instead
i wondering how to clear all the element after using a[]?
============================================================
a[0]='\0';

[Heaven_Redsky]

when you define char a[20], it is in stack, the system will clear it when you end your function. so take it easy.

[Janlex]

if you just use char[], as the up-floor, the system will make clean the space int the stack when it finish in its space;

another , if you use 'new ' or 'malloc', the heap space did't free when the program is over. so you must use 'delete 'or 'free' to free the heap space by yourself.

[hailongchang]

You can define it in a function (such as main function)as a local variable, which is allocated in the stack of the function.

[Duwchy]

define and use it in a function, then it will be freed automatically after invoke the function.