Although pass-by-reference can be used to substitute all pass-by-value functions, why is pass-by-value be considered safer?...

Although pass-by-reference can be used to substitute all pass-by-value functions, why is pass-by-value be considered safer?
When passing an integer array to a function, why do you also need to pass the number of elements in that array?

Expert Solution

Pass by value is considered safer as you cannot accidentally modify the parameter variable passed in the function and you may not run into issues related to this.

When passing an array to a function, the whole array is not passed to the function.
Instead, a pointer to the first element of the array is passed to the function.
Native arrays are not objects, they are just continuous memory locations of the defined data type. The name of the array is a pointer to the first element of the array. Example: int arr[10], is nothing but 10 continuous int memory allocations and arr is the address of the first element of the array. Adding 1 to arr will give a pointer to the next memory location.
Since it's just a pointer that is being passed to a function, the only way of knowing where the upper bound of the array lies is to manually pass in the size of the array.
Keep in mind that even though the array has just 10 elements, even arr+15 will work and accessing the location may give a garbage value.

If you have any more queries, please post them down in the comment section.

venereology answered 1 day ago

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