Stack - push pop display exit

 #include<stdio.h>

int stack[10],choice,n,top,x,i; void push(void); void pop(void); void display(void); int main() { top=-1; printf("\n Enter the size of STACK[MAX=100]:"); scanf("%d",&n); printf("\n\t STACK OPERATIONS USING ARRAY"); printf("\n\t--------------------------------"); printf("\n\t 1.PUSH\n\t 2.POP\n\t 3.DISPLAY\n\t 4.EXIT"); do { printf("\n Enter the Choice:"); scanf("%d",&choice); switch(choice) { case 1: { push(); break; } case 2: { pop(); break; } case 3: { display(); break; } case 4: { printf("\n\t EXIT POINT "); break; } default: { printf ("\n\t Please Enter a Valid Choice(1/2/3/4)"); } } } while(choice!=4); return 0; } void push() { if(top>=n-1) { printf("\n\tSTACK is over flow"); } else { printf(" Enter a value to be pushed:"); scanf("%d",&x); top++; stack[top]=x; } } void pop() { if(top<=-1) { printf("\n\t Stack is under flow"); } else { printf("\n\t The popped elements is %d",stack[top]); top--; } } void display() { if(top>=0) { printf("\n The elements in STACK \n"); for(i=top; i>=0; i--) printf("\n%d",stack[i]); printf("\n Press Next Choice"); } else { printf("\n The STACK is empty"); } }