说明：  整型栈是一种先进后出的存储结构，对其进行的操作通常包括判断栈是否为空、向栈顶添加一个整型元素、出栈等。整型栈类型及其操作函数采用非面向对象的纯C语言定义，请将完成上述操作的所有函数采用纯C语言编程， 然后写一个main函数对栈的所有操作函数进行测试。
(Integer stack is advanced out after a storage structure, operating its typically include determining whether the stack is empty, add an element to the integer stack, the stack and so on. Stack integer types and operating functions using non-object-oriented pure C language definition, all functions please complete the operation using pure C language programming, and then write a main function of all operating functions stack testing.)