C Programming Code Examples C > File Operations Code Examples Program to Print Environment Variables Program to Print Environment Variables This C Program prints environment variables. Environment variables are a set of dynamic named values that can affect the way running processes will behave on a computer. #include <stdio.h> void main(int argc, char *argv[], char * envp[]) { int j; for (j = 0; envp[j] != NULL; j++) { printf("\n%s", envp[j]); } }