Please, Explain... Why there is a memory leak in the following code?

Question

int *ptr = (int*)malloc(sizeof(int));
ptr = NULL;
free(ptr);

Answer 1

Without the second line, there is no memory leak.

Answer 2

it means we can not free a null pointer ?

Answer 3

ok now i understand it, after you edited the answer... thanks for your help...

Answer 4

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