How do I check OS with a preprocessor directive?

Question

Aryan Kumar · Answer

Sure, I can help you with that.
Here is how you can check the operating system in C using preprocessor directives:
C
#include andlt;stdio.h>
#ifdef _WIN32
#define OS "Windows"
#elif __linu_
#define OS "Linux"
#elif __APPLE__
#define OS "Mac OS X"
#else
#define OS "Unknown"
#endif
int main() {
  printf("The operating system is %s
", OS);
  return 0;
}
This code first includes the andlt;stdio.h> header file, which provides the
printf() function. Then, it defines a preprocessor macro called 
OS. The value of this macro will be different depending on the operating system that the code is running on.
For example, if the code is running on Windows, the OS macro will be defined as
"Windows". If the code is running on Linux, the OS macro will be defined as
"Linux". And so on.
The #ifdef preprocessor directive is used to check if a macro is defined. If the macro is defined, the code between the
#ifdef and #endif directives will be compiled. Otherwise, the code will be skipped.
In this case, the #ifdef directive is used to check if the 
_WIN32 macro is defined. If it is, the code will compile and print the string "Windows" to the console. If it is not, the code will compile and print the string "Unknown" to the console.
You can also use the #elif and #else preprocessor directives to check for other operating systems. For example, the following code will print the string "Linux" if the code is running on Linux, and the string "Unknown" if it is running on any other operating system:
C
#include andlt;stdio.h>
#ifdef __linu_
#define OS "Linux"
#else
#define OS "Unknown"
#endif
int main() {
  printf("The operating system is %s
", OS);
  return 0;
}

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How do I check OS with a preprocessor directive?

Revati S Misra

Can you answer this question?

1 Answers

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