void *的分配

Question

時什麼時候適合使用

void* space_to_use = malloc(size); 

Answer 1

void* space_to_use = malloc(size); 
// malloc always return void pointer that means it can be typecast to any type. 
// before using void pointer it is necessary to typecast it into proper type. 
// for example:- 
// if size is 8 byte.It will allocate 8 byte of memory. 
/* 
void* space_to_use = malloc(size); 
char * ptr = (char*)space_to_use; 
*/ 
// These two line can be combine in one statement. 

char * ptr = (char*)malloc(size*sizeeof(char)); 
// NOTE:sizeof(char) is to make sure platform independent. 

// Same for int if we want to store some integer. 
int * ptr = (int*)malloc(size*sizeeof(int));