#include<stdio.h>

#define max 50

void push();

void pop();

void display();

int menu();

int stack[max],top=0;

int main()

{

intch;

do

{

{

ch=menu();

switch(ch)

case 1: push();

break;

case 2: pop();

break;

case 3: display();

break;

case 4: printf("----Stack exited----");

break;

default: printf("Enter a valid choice!");

}

}

while(ch!=4);

return 0;

}

int menu()

{

int ch;

printf("-----Select the operation you want to perform on the stack-----\n");

printf("1. Push\n2. Pop\n3. Display\n4. Exit\n");

printf("Enter your choice\t");

scanf("%d",&ch);

return ch;

}

void push()

{

if(top==max) printf("Stack overflow!\n");

else

{

int element;

printf("----Enter element----\n");

scanf("%d",&element);

printf("----Element has been pushed----\n");

stack[top++]=element;

}

}

void pop()

{

if(top==0) printf("----Stack Underflow!----\n");

else

{

top--;

printf("----Element has been popped out----\n");

}

}

void display()

{

if(top==0) printf("----Stack is empty!----\n");

else

{

{

inti;

printf("----Displaying stack elements----\n");

for(i=0;i<top;i++)

printf("%d\n",stack[i] );

}

}

}