List any one advantage and disadvantage of the pointer. How do you pass pointers as function arguments?

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Suresh Chand · Accepted Answer

One advantage and disadvantage of the pointer is Note: We have added many pointer advantages and disadvantages but you have to answer according to the question. Advantage: Pointers provide direct access to memory Pointers provide a way to return more than one value to the functions Reduces the storage space and complexity of the program Reduces the execution time of the program Provides an alternate way to access array elements Pointers can be used to pass information back and forth between the calling function and called function. Pointers allow us to perform dynamic memory allocation and deallocation. Pointers help us to build complex data structures like a linked list, stack, queues, trees, graphs, etc. Pointers allow us to resize the dynamically allocated memory block. Addresses of objects can be extracted using pointers Disadvantage: Uninitialized pointers might cause segmentation faults. A dynamically allocated block needs to be freed explicitly.  Otherwise, it would lead to a memory leak. Pointers are slower than normal variables. If pointers are updated with incorrect values, it might lead to memory corruption. Pass pointer as function argument: Just like any other argument, pointers can also be passed to a function as an argument. Let's take an example to understand how this is done. In this example, we are passing a pointer to a function. When we pass a pointer as an argument instead of a variable then the address of the variable is passed instead of the value. So any change made by the function using the pointer is permanently made at the address of a passed variable. This technique is known as call by reference in C. Example: This is one of the most popular examples that show how to swap numbers using call-by-reference. #include <stdio.h> void swapnum(int *num1, int *num2) { int tempnum; tempnum = *num1; *num1 = *num2; *num2 = tempnum; } int main( ) { int v1 = 11, v2 = 77 ; printf('Before swapping:'); printf('nValue of v1 is: %d', v1); printf('nValue of v2 is: %d', v2); /*calling swap function*/ swapnum( &v1, &v2 ); printf('nAfter swapping:'); printf('nValue of v1 is: %d', v1); printf('nValue of v2 is: %d', v2); } The output of the above program is Before swapping: Value of v1 is: 11 Value of v2 is: 77 After swapping: Value of v1 is: 77 Value of v2 is: 11

List any one advantage and disadvantage of the pointer. How do you pass pointers as function arguments?

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List any one advantage and disadvantage of the pointer. How do you pass pointers as function arguments?

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