#include<stdio.h>
#include<conio.h>
#define N 5
int top=-1,i,x;
void push(int s[N]);
void pop(int s[N]);
void peep(int s[N]);
void change(int s[N]);
void dis(int s[N]);
void main()
{
int x=1,s[N];
clrscr();
while(x!=6)
{
clrscr();
printf("\n1: push");
printf("\n2: pop");
printf("\n3: peep");
printf("\n4: change");
printf("\n5: display");
printf("\n6: exit");
printf("\n\nEnter ur option: ");
scanf("%d",&x);
switch (x)
{
case 1:
push(s);
break;
case 2: pop(s);
break;
case 3: peep(s);
break;
case 4: change(s);
break;
case 5: dis(s);
break;
case 6: break;
default:
printf("\nenter the right option");
getch();
}
}
}
void push(int s[])
{
clrscr();
if(top>=N-1)
{
printf("overflow");
getch();
}
else
{
top++;
printf("enter the no: ");
scanf("%d",&s[top]);
dis(s);
}
}
void pop(int s[])
{
clrscr();
if(top<0)
{
printf("underflow on pop");
}
else
{
x=s[top];
printf("the number poped is %d :",x);
top--;
dis(s);
}
getch();
}
void peep(int s[])
{
printf("enter the index u want :");
scanf("%d",&i);
if(top-i+1<0)
{
printf("stack underflow on peep");
}
else
{
printf("the peeped no is %d\n",s[top-i+1]);
}
dis(s);
getch();
}
void change(int s[])
{
printf("enter the index which u want to b changed");
scanf("%d",&i);
if(top-i+1<0)
printf("stack underflow on change");
else
{
printf("\nenter the no:");
scanf("%d",&x);
s[top-i+1]=x;
printf("the changed no is %d",s[top-i+1]);
}
dis(s);
}
void dis(int s[])
{
for(i=top;i>=0;i--)
printf("\n%d",s[i]);
getch();
}
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