头文件和源文件定义之C++基础
头文件
#ifndef C_LEARNING_02_HEAD_H_
#define C_LEARNING_02_HEAD_H_
int age = 18;
#endif
源文件
#include "02_head.h"
#include<iostream>
using namespace std;
int main(){
cout<<age<<endl;
}
CmakeLists
cmake_minimum_required("VERSION 3.15")
project(c_learning)
set(CMAKE_CXX_STANDARD 14)
add_executable(02_head chapter03/02_head.cpp)