Write a C Program to perform all stack operations using array

Program:-

#include<stdio.h>

#include<stdlib.h>

#define size 10
void Push();
void Pop();
void Display();
int CheckStackFull();
int CheckStackEmpty();
struct StackArray
{
int array[size],top;

}
ptr;
int main()
{
int choice,contin;
ptr.top=-1;
do
{
printf("Enter\n1 - Push\n2 - Pop\n3 - Display\n4 - Exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1: Push();
break;
case 2: Pop();
break;
case 3: Display();
break;
case 4: exit(0);
break;
default: printf("Enter Valid Choice\n");
break;

}
printf("Enter 1 to continue otherwise any other number\n");
scanf("%d",&contin);

}
while(contin==1);
return(0);

}
void Push()
{
int flag=CheckStackFull();
if(flag==1)
{
int value;
printf("Enter value to push into stack\n");
scanf("%d",&value);
ptr.top+=1;
ptr.array[ptr.top]=value;

}
else
{
printf("Stack is Full\n");

}

}
void Pop()
{
int flag=CheckStackEmpty();
if(flag==1)
{
printf("Popped Element is %d\n",ptr.array[ptr.top]);
ptr.top-=1;

}
else
{
printf("Stack is Empty\n");

}

}
void Display()
{
int i,flag=CheckStackEmpty();
if(flag==1)
{
printf("Elements present in stack\n");
for(i=ptr.top;i>-1;i--) printf("%d\n",ptr.array[i]);
printf("\n");

}
else
{
printf("Stack is Empty\n");

}

}
int CheckStackFull()
{
if(ptr.top==size-1) return 0;
else return 1;

}
int CheckStackEmpty()
{
if(ptr.top==-1) return 0;
else return 1;

}

Output:-

Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
1
Enter value to push into stack
30
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
1
Enter value to push into stack
35
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
3
Elements present in stack
35 30
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
1
Enter value to push into stack
89
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
2
Popped Element is 89
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit 2
Popped Element is 35
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
3
Elements present in stack
30
Enter 1 to continue otherwise any other number
1
Enter
1 - Push
2 - Pop
3 - Display
4 - Exit
4