Program for Stack implementation through Array

#include "stdio.h"
#include "ctype.h"
# define MAXSIZE 200
int stack[MAXSIZE];
int top; //index pointing to the top of stack
void main()
{
void push(int);
int pop();
int will=1,i,num;
clrscr();
while(will ==1)
{
printf(" MAIN MENU:
1.Add element to stack
2.Delete element from the stack
");
scanf("%d",&will);

switch(will)
{
case 1:
printf("Enter the data... ");
scanf("%d",&num);
push(num);
break;
case 2: i=pop();
printf("Value returned from pop function is %d ",i);
break;
default: printf("Invalid Choice . ");
}

printf("Do you want to do more operations on Stack ( 1 for yes, any other key to exit) ");
scanf("%d" , &will);
} //end of outer while
} //end of main


void push(int y)
{

if(top>MAXSIZE)
{
printf("STACK FULL");
return;
}
else
{
top++;
stack[top]=y;
}
}

int pop()
{
int a;
if(top<=0) { printf("STACK EMPTY"); return 0; } else { a=stack[top]; top--; } return(a); }

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