Stack Implementation

#include<stdio.h>
#include<stdlib.h>
 
int stack[100];
int top=-1;
 
void push();
void pop();
void peek();
void Display();
 
int main(){
		int x;
 
 
		while(x!=5){
			printf("\n\n\nWelcome To stack\n\n");
			printf("\n1. Push\n");
			printf("2. Pop\n");
			printf("3. Peek\n");
			printf("4. Display\n");
			printf("5. Exit\n");
			scanf("%d",&x);
			printf("\n\n\n");
		switch(x){
			case 1:
				push();
				break;
			case 2:
				pop();
				break;
			case 3:
				peek();
				break;
			case 4:
				Display();
				break;
			case 5:
				exit(0);
			default:
				printf("Enter valid choice");
		}
	}
	return 0;
}
 
void push(){
	int x;
	printf("Enter Data ");
	scanf("%d",&x);
	top++;
	stack[top]=x;
}
void pop(){
	int item;
	if(top==-1){
		printf("underflow");
	}
	else{
		item=stack[top];
		top--;
		printf("%d deleted\n",item);
	}
}
void peek(){
	if(top==-1){
		printf("underflow");
	}
	else{
		printf("\n%d\n",stack[top]);
	}
}
void Display(){
	int i;
	for(i=top;i>=0;i--){
		printf(" %d \n\n",stack[i]);
	}
}