What is Malloc() function in C Programming Language?

What is Malloc() function in C Programming Language?

A malloc() function is used for  dynamic memory allocation. It is defined in stdlib.h or malloc.h depending on the operating system. Memory allocation by malloc() is persistent.  

• void  *malloc(size_t size);

Example:

• #include<stdio.h>
• #include<stdlib.h>
• void main()
• {
•           int array[10];
•           int *ptr = (int *) malloc(10 * sizeof (int));
• if (ptr == NULL)
• {
• }
•           else
•          {
•                   free(ptr);
•                   ptr=NULL;
•           }
• }