A Stack has an ordered list of elements & an array is also utilized to store ordered list of elements. Therefore, it would be very simple to manage a stack by using an array. Though, the problem along with an array is that we are needed to declare the size of the array before using it in a program. Thus, the size of stack would be fixed. However, an array & a stack are completely different data structures, an array may be utilized to store the elements of a stack. We may declare the array along a maximum size large sufficient to manage a stack. Program1 implements a stack by using an array.