Table of Contents

Building Library Software Manual

Author: Philip Nelson

Language: C++. The code can be compiled using the GNU C++ compiler (gcc). A make file is included to compile an example program

For example,

make

will produce an executable that is linked to libmaceps.a ./maceps .out that can be executed.

Description/Purpose: This code shows the capacity to compile and link to an external library.

Input: There are no inputs needed in this case.

Output: This code demonstrates smaceps and dmaceps for calculating the single and double machine precision for any computer.

Usage/Example:

#include <iostream>
#include "maceps.hpp"

int main()
{
  auto [sprec, seps] = smaceps();
  auto [dprec, deps] = dmaceps();

  std::cout << "single\t" << sprec << '\t' << seps << '\n';
  std::cout << "double\t" << dprec << '\t' << deps << '\n';
}

Output from the lines above

single	24	1.19209e-07
double	53	2.22045e-16

Implementation/Code: The following are the steps taken to compile the library:

# g++ -std=c++17 -O3 -c maceps.cpp
# ar crv libmaceps.a maceps.o

# make
g++ -std=c++17 -O3 main.cpp -L./ -lmaceps -o maceps.out

Last Modified: September 2018