Operations on stack using arrays in C

Below is the code to perform operations on stack using arrays.

#include <stdio.h>
#include <stdlib.h>
#define n 5
int top=-1;
int stack[5];
int value;
int isEmpty(){
	if(top==-1){
		return 1;
	}else{
		return 0;
	}
}
int isFull(){
	if(top==n-1){
		return 1;
	}else{
		return 0;
	}
}
void push(int data){
	if(isFull()){
		printf("Overflow");
	}else{
		top+=1;
		stack[top]=data;
	}
}
int pop(){
	if(isEmpty()){
		printf("Underflow");
	}else{
		value=stack[top];
		top--;
	}
	return value;
}
int peek(){
	//int value;
	if(isEmpty()){
		printf("Underflow");
	}else{
		value=stack[top];
	}return value;
}
void print(){
	if(isEmpty()){
		printf("Underflow");
	}else{
		for(int i=0;i<=top;i++){
			printf("%d ",stack[i]);
		}
	}
}
int main(){
	int choice,data;
	while(1){
		printf("\n1.Insert element\n2.Delete element\n3.Top value\n4.Display elements\n5.Exit");
		printf("\nEnter your choice:");
		scanf("%d",&choice);
		switch(choice){
			case 1:
				printf("\nEnter element to be inserted:");
				scanf("%d",&data);
				push(data);
				break;
			case 2:
				data=pop();
				printf("\nDeleted element is %d",data);
				break;
			case 3:
				data=peek();
				printf("\nTop value is %d",data);
				break;
			case 4:
				printf("\nElements in the stack: ");
				print();
				break;
			case 5:
				exit(1);
			default:
				printf("\nEnter valid choice....");
				break;
			}
		}
	}

OUTPUT:

1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:1

Enter element to be inserted:35

1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:1

Enter element to be inserted:45

1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:3

Top value is 45
1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:4

Elements in the stack: 35 45
1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:2

Deleted element is 45
1.Insert element
2.Delete element
3.Top value
4.Display elements
5.Exit
Enter your choice:5