STACK IMPLEMENTATION

#include<stdio.h>
int push(int a[],int top)
{   char c;
    
   S: top++;
    scanf("%d",&a[top]);
    printf("Want to push more?(y/n):");fflush(stdin);
    scanf("%c",&c);
    if(c=='y')
    goto S;
    return top;

}
int pop(int a[],int top)
{
     if(top == -1)
        printf(" -->>Stack is Underflow <<--");
    else
    {
    printf("Element %d popped!",a[top]);
    top=top-1;
    }
    return top;
}

void display(int a[],int top)
{
    for(int i=top;i>=0;i--)
    printf("%d\n",a[i]);
}

void peek(int a[],int top)
{
    printf("%d\n",a[top]);
}

#define Max 10
int main()
{ 
 int stack[Max],top=-1,ch;
char c;

A: printf("\tMenu \n 1 Push \n 2 Pop \n 3 Display  \n 4 Peek ");
printf("\nEnter your choice: ");
scanf("%d",&ch);


    switch(ch)
{ 
    case 1:  
            top= push(stack,top);
          break;
    case 2:
            top=pop(stack,top);
            break;
    case 3:display(stack,top);
            break;
    case 4:peek(stack,top);
            break;
    default:
            printf("Wrong input!");
            break;
}

printf("\nMENU?(y/n): ");fflush(stdin);
scanf("%c",&c);
if(c=='y')
goto A;

return 0;
}