Write a C program to display as well as resets the environment variable such as path, home, root etc.

#include <stdio.h>
void main(int argc, char argv[], char * envp[])
{
int i;
for (i = 0; envp[i] != NULL; i++)
{
printf("\n%s", envp[i]);
}
/ set environment variable _EDC_ANSI_OPEN_DEFAULT to "Y" /
setenv("_EDC_ANSI_OPEN_DEFAULT","Y",1);
/ set x to the current value of the _EDC_ANSI_OPEN_DEFAULT*/
x = getenv("_EDC_ANSI_OPEN_DEFAULT");
printf("program1 _EDC_ANSI_OPEN_DEFAULT = %s\n",
(x != NULL) ? x : "undefined");
}