Create a tutorial.cxx file with the following code:
#include <iostream>
#include <stdlib.h>
#include "MathFunctions.h"
using namespace std;
int main(int argc, char* argv[])
{
if(argc < 2){
cout<<"Usage: "<<argv[0]<<" number"<<endl;
return 1;
}
cout<<"The sqrt of "<<argv[1]<<" is "<<mysqrt(atoi(argv[1]))<<endl;
return 0;
}
Create a CMakeLists.txt in the same folder of tutorial.cxx with the following code:
cmake_minimum_required(VERSION 2.6)
Project(Tutorial)
include_directories("${PROJECT_SOURCE_DIR}/MathFunctions")
add_subdirectory(MathFunctions)
add_executable(Tutorial tutorial.cxx)
target_link_libraries(Tutorial MathFunctions)
Create a folder called MathFunctions and go into it:
mkdir MathFunctions && cd MathFunctions
Create a mysqrt.cxx file with the following code:
#include "MathFunctions.h"
double mysqrt(int number)
{
if(number <=0)
return 0;
double delta, result;
// do ten iterations
for (int i = 0; i < 10; ++i) {
if (result <= 0) {
result = 0.1;
}
delta = number - (result * result);
result = result + 0.5 * delta / result;
}
return result;
}
Create a MathFunctions.h file with the following code:
#include <math.h> double mysqrt(int);
Create a CMakeLists.txt in this same folder with the following code:
add_library(MathFunctions mysqrt.cxx)
In order to keep the build files easy to remove, create a build folder by running
mkdir build && cd build
Run Cmake and then make
cmake .. && make
cgcvtutorials 