Having trouble displaying the contents of my array stack - c

Question

So I am learning how stack works in C, and I wrote out a little menu that allows the user to push and pop integers to and from the stack. I used the global array implementation of stack.
#include <stdio.h>
#define MAX 5
int top = -1;
int myStack[MAX];
int push(int item){
if(top >= MAX - 1){
printf("stack overflow");
return -999;
}
else{
top++;
myStack[top] = item;
}
return 1;
}
int pop(){
if(top == -1){
printf("no integer to pop from stack.");
return -999;
}
int popped = myStack[top];
top--;
return popped;
}
void displayStack(int myStack[], int top){
for(int i = 0; i < top; i ++){
printf("%d ", myStack[i]);
}
}
int main(){
printf("Menu Options:\n");
printf("1 - Push\n");
printf("2 - Pop\n\n");
int data, choice;
while(1){
printf("Enter choice: ");
scanf("%d", &choice);
if(choice == 1){
printf("Enter data to push: ");
scanf("%d", &data);
push(data);
displayStack(myStack, top);
printf("\n\n");
}
if(choice == 2){
pop();
displayStack(myStack, top);
printf("\n\n");
}
if(choice == 3){
break;
}
}
return 0;
}
My problem is, when I run the code for the first time and insert 1 to push an integer to the stack, everytime, the first call to push, my display doesn't return anything. Only the second time will it display an item from the stack on the screen.
I think this has something to do with the indexes in my display function, but I'm pretty sure I have them correct? After I call push, the top of the stack for the first time goes from -1 to 0, and my displayStack function is starting at index 0.
Any help would be appreciated, thank you!