All Notes on BCA

#include<stdio.h>
#include<conio.h>
#define max 5
void push();
int pop();
void display();

int stack[max];
int top=-1;
void main()
{
int n,item,ch,ele;
clrscr();
do
{
clrscr();
printf("1. Push Operation \n2. Pop Operation \n3. Display\n4. Exit\n\nEnter Your Choice : ");
scanf("%d",&ch);
switch(ch)
{
case 1:
clrscr();
if(top==max-1)
{
printf("Stack Overflow !!!!!!!!!");
getch();
}
else
{
printf("\nEnter Any Number : ");
scanf("%d",&item);
push(item);
break;
}

case 2:

if(top==-1)
printf("Stack Underflow !!!!!!");
else
ele = pop();
printf("Deletion Element is = %d",ele);
getch();
break;

case 3:
display();
break;
}
}while(ch != 4);
// getch();
}

/////////////////////////
void push(int number)
{
top++;
stack[top] = number;
}

int pop()
{
int num;
if(top == -1)
printf("Stack Underflow !!!!!!");
else
num = stack[top];
top--;
return num;
}

void display()
{
int i;
clrscr();
if(top == -1)
printf("Stack Undrflow !!!!!!!!");
else
{
printf("Stack Elements - \n");
for(i=top;i>=0;i--)
{
printf("%d\n",stack[i]);
}
}
getch();
} 

OUTPUT
1. Push Operation
2. Pop Operation 
3. Display
4. Exit
Enter Your Choice : 1
Enter any Number : 10

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 1
Enter any Number : 20

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 1
Enter any Number : 30

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 1
Enter any Number : 40

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 1
STACK OVERFLOW!!!!!!!!!

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 3
Stack Element -
50
40
30
20
10


1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
Deletion Element is = 50

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
Deletion Element is = 40

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
Deletion Element is = 30
1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
Deletion Element is = 20
1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
Deletion Element is = 10

1. Push Operation 
2. Pop Operation 
3. Display
4. Exit
 
Enter Your Choice : 2
STACK UNDERFLOW !!!!!!!!!