How to use a Class or Struct In C++
We can define a class or struct that contains an array as a member variable, and then define a member function that returns the size of the array. This method is useful if we need to pass the array and its size as a single parameter to a function.
C++ program to Find the Size of an Array using a Class and Member Function
C++
// C++ program to find size of // an array usinga Class or Struct #include <iostream> using namespace std; class MyArray { private : // declare the array int arr[100]; // size of the array int size; public : // read values into the array void readArray(); // get the size of the array int getSize(); }; void MyArray::readArray() { // initialize size to 0 size = 0; while (size < 100) { cout << "Enter a value for element " << size << " (or -1 to stop): " ; cin >> arr[size]; // exit the loop if -1 is entered if (arr[size] == -1) { break ; } // increment size for each element entered size++; } } int MyArray::getSize() { // return the size of the array return size; } int main() { // declare an object of MyArray MyArray a; // read values into the array a.readArray(); // get the size of the array int size = a.getSize(); // print the size of the array cout << "Size of the array: " << size << endl; return 0; } // This code is contributed by Susobhan Akhuli |
Output
Enter a value for element 0 (or -1 to stop): Enter a value for element 1 (or -1 to stop): Enter a value for element 2 (or -1 to stop): Enter a value for element 3 (or -1 to stop): Enter a value for el...
Output
Enter a value for element 0 (or -1 to stop): 8 Enter a value for element 1 (or -1 to stop): 4 Enter a value for element 2 (or -1 to stop): 2 Enter a value for element 3 (or -1 to stop): 7 Enter a value for element 4 (or -1 to stop): 5 Enter a value for element 5 (or -1 to stop): 6 Enter a value for element 6 (or -1 to stop): -1 Size of the array: 6
Complexity Analysis
- Time complexity: O(1), getSize() method returns size member variable that takes constant time.
- Auxiliary space: O(1)
How to Find Size of an Array in C++ Without Using sizeof() Operator?
In C++, generally, we use the sizeof() operator to find the size of arrays. But there are also some other ways using which we can find the size of an array. In this article, we will discuss some methods to determine the array size in C++ without using sizeof() operator.
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