#include<stdio.h>

int stack[5], n = 5, top = -1, option, loop = 1;

void push();
void display();

int main(){
	
	while(loop){
		printf("\n\n-----------------\n1. Push\n2. Pop\n3. Display Stack\n4. Exit\n-----------------\n");
		printf("Enter option: ");
		scanf("%d", &option);
		printf("-----------------");
		
		switch(option){
			case 1:
				push();
				break;
			case 2:
				pop();
				break;
			case 3:
				display();
				break;
			case 4:
				loop = 0;
				break;
			default:
				printf("\n\nInvalid option.");
				break;
		}
	}
	
	
}

void push(){
	int x;
	
	if(top >= n - 1)
		printf("\n\nSTACK is OVERFLOW");
	else{
		printf("\n\nEnter a value to be pushed: ");
		scanf("%d", &x);
		top++;
		stack[top] = x;
		printf("PUSHED!!");
	}
	
}

void pop(){
	int x;
	
	if(top <= -1){
		printf("\n\nSTACK is UNDERFLOW");
	}
	else{
		printf("\n\nPOPPED!!");
		printf("\n\nThe popped element is %d", stack[top]);
		top--;
	}
}

void display(){
	int i;
	
	printf("\n\nSTACK: [");
	for(i = top; i > -1; i--){
		printf("%d", stack[i]);
		if(i != 0)
			printf(", ");
	}
	printf("]");
}