C library functions -malloc()
C Standard Library - <stdlib.h>
Description
C Library Functionsvoid *malloc(size_t size)Allocate the required memory space and return a pointer to it.
Declaration
The following is the declaration of the malloc() function.
void *malloc(size_t size)
Parameter
- size-- The size of the memory block, in bytes.
Return Value
This function returns a pointer to the allocated memory. If the request fails, it returns NULL.
Example
The following example demonstrates the usage of the malloc() function.
Example
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
char *str;
/*Initial memory allocation*/
str = (char *) malloc(15);
strcpy(str, "example");
printf("String = %s, Address = %u\n", str, str);
/*Reallocate memory*/
str = (char *) realloc(str, 25);
strcat(str, ".com");
printf("String = %s, Address = %u\n", str, str);
free(str);
return(0);
}
Let's compile and run the above program, which will produce the following results:
String = example, Address = 3662685808 String = example.com, Address = 3662685808other extensions