Stack.c

#include <stdio.h>
#include <stdlib.h>
//Global Variable
int size, choice, ele;

//Creating Stack
struct stack
{
    int arr[100];
    int top;

} st;

//Inserting Element
void push(int element)
{
    if ((st.top) == size)
    {
        printf("\n Stack is Full");
    }
    else
    {
        st.top--;
        printf("\nEnter a Value ");
        scanf("%d", &ele);
        st.arr[st.top] = ele;
    }
}

//Removing Element
int pop()
{
    if ((st.top) == -1)
    {
        printf("\nStack is Empty");
    }
    else
    {
        int out;
        out = st.arr[st.top];
        st.top++;
        return out;
    }
}

//Peek
int peek()
{
    int display;
    display = st.arr[st.top];
    return display;
}

//Display Stack
void display()
{
    if ((st.top) >= 0)
    {
        printf("\n\nElements in the Stack");
        int i;
        for (i = st.top; i >= 0; i++)
        {
            printf("\n%d", st.arr[i]);
        }
    }
    else
    {
        printf("No elements to Display");
    }
}

int main()
{
    st.top = -1;
    printf("Enter a Stack size less than 100 : ");
    scanf("%d", &size);
    printf("\nStack Operations.....");
    printf("\n\t 1.PUSH\n\t 2.POP\n\t 3.PEEK\n\t 4.DISPLAY\n\t 5.EXIT");

    do
    {
        printf("\nEnter Your Choice  ");
        scanf("%d", &choice);
        switch (choice)
        {
        case 1:
        {
            push(ele);
            break;
        }
        case 2:
        {
            printf("%d", pop());
        }
        case 3:
        {
            printf("%d", peek());
        }
        case 4:
        {
            display();
            break;
        }
        case 5:
        {
            printf("\n\t EXIT Point");
            break;
        }
        default:
            printf("\nEnter a correct choice (1,2,3,4,5)");
        }
    } while (choice = 5);
    return 0;
}