使用G ++编译多个.cpp和.h文件
要一次编译多个文件，例如file_name.h或file_name.cpp，我们可以像列表一样使用文件。语法如下：
g++ abc.h xyz.cpp
要运行程序，我们可以使用它-
./a.out
示例
float area(float r){
return (3.1415*r*r); //area of a circle
}
float area(float l, float w){
return (l * w); //area of a rectangle
}示例
#include <iostream>
#include "area.h"
using namespace std;
main(){
cout << "Area of circle with radius 2.5 is: " << area(2.5) << endl;
cout << "Area of rectangle with length and width are 5 and 7 is: " << area(5, 7) << endl;
}输出结果
$ g++ area.h find_area.cpp $ ./a.out Area of circle with radius 2.5 is: 19.6344 Area of rectangle with length and width are 5 and 7 is: 35 $