Writing OS-independent code in C/C++

A program that can interact with the operating system, regardless of which operating system it is running on.

Most c/c compilers have the ability to define macros to detect the operating system.

Some GCC compiler macros include:

• _WIN32: Macros for 32-bit and 64-bit Windows operating systems.

• _WIN64: Macro for 64-bit Windows operating systems.

• _UNIX: Macro for UNIX operating system.

• _APPLE_: macOS macro.

Based on these defined macros, let’s create a program that is not restricted by the operating system:

Example

Live demonstration

#include <iostream>
using namespace std;
int main() {
   #ifdef _WIN32
      system("dir");
   #else
      system("ls");
   #endif
      return 0;
}

Output

This lists all files of the directory to the output screen irrespective of OS.

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