#include <stdio.h>
#include <stdlib.h>
_CRTIMP extern char **_environ;
int main(int argc, const char *argv[]) {
if (_putenv_s("MY_NEW_VAR", "new_value") != 0) {
}
if (_environ != NULL) {
for (size_t i = 0; _environ[i] != NULL; ++i) {
puts(_environ[i]);
}
}
return 0;
}