What is Memory Leak? How can we avoid?

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Memory leak occurs when programmers create a memory in heap and forget to delete it.
Memory leaks are particularly serious issues for programs like daemons and servers which by definition never terminate.

/* Function with memory leak */
#include <stdlib.h>

void f()
{
   int *ptr = (int *) malloc(sizeof(int));

   /* Do some work */

   return; /* Return without freeing ptr*/
}

To avoid memory leaks, memory allocated on heap should always be freed when no longer needed.

/* Function without memory leak */
#include <stdlib.h>;

void f()
{
   int *ptr = (int *) malloc(sizeof(int));

   /* Do some work */

   free(ptr);
   return;
}

GATE CS Corner    Company Wise Coding Practice

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