#include <stdio.h> 
#include <stdlib.h> 
#include <alloc.h> 
#include <string.h> 
#include <dos.h> 

int main(void) 
{ 
   char *path, *ptr; 
   int i = 0; 

   /* get the current path environment */ 
   ptr = getenv("PATH"); 

   /* set up new path */ 
   path = malloc(strlen(ptr)+15); 
   strcpy(path,"PATH="); 
   strcat(path,ptr); 
   strcat(path,";c:\\temp"); 

   /* replace the current path and display current environment */ 
   putenv(path); 
   while (environ[i]) 
       printf("%s\n",environ[i++]); 

   return 0; 
}