Why the size of the array needs to be passed as a parameter?

The size of an array is not passed with the array itself. Therefore, if the other function needs the size, it will have it as a parameter. The thing is, some functions implicitly understand the array to be of a certain size. So they won’t need to have it specified explicitly.

Why do we pass the size of an array in C?

Because arrays are already pointers, there is usually no reason to pass an array explicitly by reference. The only reason for passing an array explicitly by reference is so that you can change the pointer to point to a different array.

Do you need to specify the size of an array in C?

C does not support arrays with a dynamic number of elements. The number of elements of an array must be determined either at compile time or since C99 can be evaluated at runtime at the point of creation. Once the array is created, its size is fixed and cannot be changed.

Is it necessary to mention size of the array?

Yes, it is necessary.

Can the size of operator be used to tell the size of an array passed to a function?

Can the sizeof operator be used to tell the size of an array passed to a function? No. There s no way to tell, at runtime, how many elements are in an array parameter just by looking at the array parameter itself. Remember, passing an array to a function is exactly the same as passing a pointer to the first element.

How does sizeof determine the size of an array?

To determine the size of your array in bytes, you can use the sizeof operator: int a[17]; size_t n = sizeof(a); On my computer, ints are 4 bytes long, so n is 68. To determine the number of elements in the array, we can divide the total size of the array by the size of the array element.

When we pass array to a function that is passed as?

To pass an entire array to a function, only the name of the array is passed as an argument.

Is it necessary to give the size of an array in an array declaration?

We need to give the size of the array because the complier needs to allocate space in the memory which is not possible without knowing the size. Compiler determines the size required for an array with the help of the number of elements of an array and the size of the data type present in the array.