请教 code::blocks 中包含头文件的问题

下载了 code::blocks 感觉挺好的，很轻，功能也不错，不过好像我使用姿势不对？

写了Stackcal.h Stackcal.cpp定义一个堆栈类

//this is *.h
#ifndef _STACKCAL_H
#define _STACKCAL_H

class StackCal{
	private:
		int MAXSIZE;
		char* stack_ptr;
		char* stack_g;
	public:
		StackCal(int t);
		~StackCal();
		bool push(char s);
		char pop();
		bool isempty();
		bool isfull();
};

#endif

//this is *.cpp
#include "stackcal.h"

StackCal::StackCal(int t){
	MAXSIZE = t;
	stack_g = new char[MAXSIZE];
	stack_ptr = &stack_g[0];
}

StackCal::~StackCal(){
	delete[] stack_g;
}

bool StackCal::isempty(){
	return stack_ptr==&stack_g[0] ? true : false;
}

bool StackCal::isfull(){
	return stack_ptr==&stack_g[MAXSIZE+1] ? true : false;
}

bool StackCal::push(char s){
	if (isfull()){
		return false;
	}
	*stack_ptr++ = s;
	return true;
}

char StackCal::pop(){
	if (isempty()){
		return 'x';
	}
	char result = *--stack_ptr;
	return result;
}

然后另一个文件中调用

#include "stackcal.h"
#include <iostream>
int main(){
	StackCal op = StackCal(10);
	char a = 'a';
	char b = 'b';
	op.push(a);
	op.push(b);
	std::cout << op.pop() << std::endl;
	std::cout << op.pop() << std::endl;
	return 0;
}

调用时#include <Stackcal.h>报错:

undefined reference to `StackCal::StackCal(int)'
undefined reference to `StackCal::push(char)'
undefined reference to `StackCal::push(char)'
undefined reference to `StackCal::pop()'
undefined reference to `StackCal::pop()'
undefined reference to `StackCal::~StackCal()'
undefined reference to `StackCal::~StackCal()'

当改为包含*.cpp文件#include <Stackcal.cpp>正常过编译

求教，是我哪里姿势不对吗....