C Tutorial/stdlib.h/malloc

malloc

Item Value Header file stdlib.h Declaration void *malloc(size_t size); Return returns a pointer to the memory. If there is insufficient memory, malloc() returns a null pointer.

It is important to verify that the return value is not null before using it.

Allocate sufficient memory to hold structures of type addr:

<source lang="cpp">#include<stdio.h>

 struct addr {
   char name[40];
   char street[40];
   char city[40];
   char state[3];
   char zip[10];
 };
 main()
 {
   struct addr *p;
   p = malloc(sizeof(struct addr));
   if(p==NULL) {
     printf("Allocation Error\n");
     exit(1);
   }
   return p;
 }</source>