Printing all environment variables in C / C++

Question

How do I get the list of all environment variables in C and/or C++?

I know that getenv can be used to read an environment variable, but how do I list th

Answer 1

LPTCH WINAPI GetEnvironmentStrings(void);

http://msdn.microsoft.com/en-us/library/ms683187%28VS.85%29.aspx

EDIT: only works on windows.

Answer 2

#include<stdio.h>

extern char **environ;

int main() {
  int i = 1;
  char *s = *environ;

  for (; s; i++) {
    printf("%s\n", s);
    s = *(environ+i);
  }

  return 0;
}

Answer 3

I think you should check environ. Use "man environ".