Memory leak refers to a situation that occurs in C/C++. When a program dynamically allocates memory, it does not release the memory correctly, causing the memory to be unusable again, resulting in a memory leak. This may cause the program to run slower, use more memory, or even cause the program to crash

A memory leak occurs when the programmer previously allocated a block of memory. Then the programmer cannot release it correctly. This memory is no longer used by the program. So that place was kept for no reason. That's why this is called a memory leak.

For memory leaks, some memory blocks may be wasted. This may also reduce performance in this case if the system has enough memory.

Example

void my_func() {
   int *data = new int;
   *data = 50;
}

The problem here is that the data pointer is never deleted, so the memory is wasted.

Example

#include <stdio.h>
main(void) {
   auto int my_fun();
   my_fun();
   printf("Main Function\n");
   int my_fun() {
      printf("my_fun function\n");
   }
   printf("Done");
}

Output

my_fun function
Main Function
Done

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