C_82 What is Dangling pointer in C | C Language Tutorials

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[@Kotivana_9]

A pointer is said to be dangling pointer, if it is pointing to the non existing memory location. free(pointer_name) = deallocates the memory allocated by the malloc() function.

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[@Raam1827]

I think static variable's scope is depend on where it's initialized if we declare globally scope throughout the program otherwise if we declare locally the scope is within the block... But the lifetime of the static variable will be throughout the program that's why you can access the static variable value by the pointer

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Thank you for uploading dangling pointer madam

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Skip 0:27 to 1:54

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Ma'am please make video onconstant pointer, pointer to constant and constant pointer .

[@ParamitaDey-bi1mg]

15:55 Why ptr will not give the value of a ? It is a return type function so it should return the value to ptr.. pls anyone explain

[@741ibrahim2]

hiii !!!!!! here the a is local variable and as ifcontroll goes out of that function the memory of a is vanished ie in future if we try to access its valule we cant some garbage value is printed !!!! hope this is making sense !!!!! better to use static key word while declaring local variables so that it can be accessed through out the programme !!!!!!!!!!!!!!!!!!!

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*TYPE CASTING OF POINTERS IS NOT REQUIRED IWIITH VOID TYPE N C* - in this program the memory allocation using malloc function is done using pointer type casting (int*) but in C it's not required. This is required when compiling with C++ compilers. #include int main() { void *ptr_x; int *ptr_a, a = 1; ptr_x = &a; ptr_a = ptr_x; printf("%d", *ptr_a); return 0; }

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Mam here you are saying free(ptr) then the value or the address of the pointing variable will change .how will the value will free

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are pointer and dereference operator are same

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3rd type of dangling pointer can't understand

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[@debojitacharjee]

*WHY THE DANGLING POINTER SHOWS THE VALUE AND ADDRESS EVEN AFTER FREEING IT USING FREE FUNCTION?* - in the following program a pointer has been freed using the free() function but still it prints the address and value of the initialized variable. #include #include int main() { int *ptr_a = malloc(sizeof(int)); printf("Address of pointer: %p ", ptr_a); free(ptr_a); // dangling pointer? printf("Address of pointer: %p ", ptr_a); return 0; }

[@kaldtechtitan]

She said it takes some time... After going through other functions or so before being effected.

[@debojitacharjee]

@@kaldtechtitan No it can't take any time but the fact is that free function only clears the value nit the address from the pointer.