STACK_USING_C.c

#include<stdio.h>
int stack[100],choice,n,top,i,x;
void push();
void pop();
void display();

int main(){
	top=-1;
	printf("\nEnter the size of the stack,maximum 100");
	scanf("%d",&n);
	printf("\nChoose number for operation\n\t 1.PUSH \n\t 2.POP \n\t 3.DISPLAY\n\tEnter 4 to exit the function\n");
	do
	{
		scanf("%d",&choice);
		switch(choice)
		{
			case 1:
				{
					push();
					break;
				}
			case 2:
				{
					pop();
					break;
				}
			case 3:
				{
					display();
					break;
				}
			case 4:
				{
					printf("Exited");
					break;
				}
			default:
				{
					printf("\nEnter valid choice");

				}
		}
	}
	while(choice !=4);
	return 0;
}
void push(){
	if(top>=n-1)
	{
		printf("\nSTACK is full");
	}
	else
	{
		printf("\nEnter element");
		scanf("%d",&x);
		top++;
		stack[top]=x;
	}
	printf("Enter next choice:1/2/3/4");
}
void pop(){
	if(top<=-1)
	{
		printf("\nstack is empty");
	}
	else
	{
		printf("\n the popped element is %d",stack[top]);
		top--;
	}
	printf("Enter next choice 1/2/3/4");
}
void display(){
	if(top>=0)
	{
		printf("\nelements");
		for(i=top;i>=0;i--)
			printf("\n%d",stack[i]);
		printf("\npress next choice 1/2/3/4");
	}
	else
	{
		printf("\n STACK is empty");
	}
}