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  1. #include <stdio.h>
  2.  
  3. #include <sys/socket.h>
  4. #include <netinet/in.h>
  5. #include <arpa/inet.h>
  6.  
  7. int enterAddress(struct in_addr* in)
  8. {
  9. 	char buffer[32];
  10. 	int i= 0;
  11. 	memset(in, 0, sizeof(*in));
  12.     printf("Enter the IP address: ");
  13. 	do {
  14. 		int ch= getchar();
  15. 		if (ch == EOF) {
  16. 			return 0;
  17. 		}
  18. 		buffer[i]= ch;
  19. 		if (ch != '\n') {
  20. 			printf("%c", buffer[i]);
  21. 		}
  22. 		fflush(stdout);
  23. 	} while (buffer[i] > 0 && buffer[i] != '\n' && ++i < sizeof(buffer)-1);
  24. 	buffer[i]= 0;
  25. 	printf("\n");
  26.  
  27. 	if (inet_aton(buffer, in) == -1) {
  28. 		return 0;
  29. 	}
  30. 	// Here you could check that IP is not 0.0.0.0
  31. 	return i > 0;
  32. }
  33.  
  34. void printAddress(struct in_addr* in) 
  35. {
  36.     printf("You entered IP address: %s\n\n\n", inet_ntoa(*in));
  37. }
  38.  
  39. int main(void) 
  40. {
  41. 	struct in_addr dir;
  42.  
  43. 	while (enterAddress(&dir)) {
  44. 		printAddress(&dir);
  45. 	}
  46.  
  47. 	// your code goes here
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
copy 
127.0.0.1
10.244.255.1
300.300.300.300
stdout
copy 
Enter the IP address: 127.0.0.1
You entered IP address: 127.0.0.1


Enter the IP address: 10.244.255.1
You entered IP address: 10.244.255.1


Enter the IP address: 300.300.300.300
You entered IP address: 0.0.0.0


Enter the IP address:
https://ideone.com/aO9Nll
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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