INADDR_ANY, INADDR_BROADCAST, INADDR_LOOPBACK

INADDR.c

#include <stdio.h>                                                                                                                                                                                                                 
#include <netinet/in.h>                                                                                                                                                                                                            
                                                                                                                                                                                                                                   
void print_addr(unsigned int addr) {                                                                                                                                                                                               
    printf("%d.", (char)(addr >> 24));                                                                                                                                                                                             
    printf("%d.", (char)(addr >> 16));                                                                                                                                                                                             
    printf("%d.", (char)(addr >> 8));                                                                                                                                                                                              
    printf("%d\n", (char)addr);                                                                                                                                                                                                    
}                                                                                                                                                                                                                                  
                                                                                                                                                                                                                                   
int main() {                                                                                                                                                                                                                       
    print_addr(INADDR_ANY);         // 0.0.0.0                                                                                                                                                                                     
    print_addr(INADDR_BROADCAST);   // 255.255.255.255                                                                                                                                                                             
    print_addr(INADDR_LOOPBACK);    // 127.0.0.1                                                                                                                                                                                   
                                                                                                                                                                                                                                   
    return 0;                                                                                                                                                                                                                      
}