弹出功能在堆栈中不起作用

Question

I am trying to execute the pop function but my pop function is not working.

I run pop and then show and it is printing only 0

typedef struct Stack
{
  int top;
  int elements[20];
}
stack;
stack s;
void pop()
{
  s.top--;
}


 void show() 
 { 
    while(s.top>=0)
    { 
      printf("%d\n",s.elements[s.top]); 
      s.top--; 
    }
 } 

Answer 1

The function

void pop()

has a void return type. So it is not returning an object for you to print.

Answer 2

pop function should be

int pop()
{
    if(s.top == -1)  // -1 is delimiter for stack to be empty 
    {
         printf("Stack is empty\n");
         return -1;
    }
    return s.elements[s.top--];
}