1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <string.h>
4. #include <unistd.h>
5. #include <sys/socket.h>
6. #include <netinet/in.h>
7. #include <arpa/inet.h>
8. #define PORT 8080
9. #define SERVER_IP "localhost"
10. int main() {
11. int client_fd;
12. struct sockaddr_in server_address;
13. char message[1024];
14. // Create socket
15. client_fd = socket(AF_INET, SOCK_STREAM, 0);
16. if (client_fd < 0) {
17. perror("socket");
18. exit(1);
19. }
20. // Set server address
21. memset(&server;_address, 0, sizeof(server_address));
22. server_address.sin_family = AF_INET;
23. server_address.sin_port = htons(PORT);
24. inet_pton(AF_INET, SERVER_IP, &server;_address.sin_addr);
25. // Connect to server
26. if (connect(client_fd, (struct sockaddr *)&server;_address, sizeof(server_address)) < 0) {
27. perror("connect");
28. exit(1);
29. }
30. printf("Connected to servern");
31. while (1) {
32. // Get target ID and message from user
33. printf("Enter target ID (0 - 4) and message (separated by space): ");
34. fgets(message, sizeof(message), stdin);
35. // Extract target ID and message content
36. char *target_id_str = strtok(message, " ");
37.  char *message_c "n");
38. if (target_id_str != NULL && message_content != NULL) {
39. int target_id = atoi(target_id_str);
40. // Send target ID and message to server
41. sprintf(message, "%d %s", target_id, message_content); // Combine ID and message
42. int bytes_sent = send(client_fd, message, strlen(message), 0);
43. if (bytes_sent < 0) {
44. perror("send");
45. break;
46. }
47. // Receive and print server response (optional)
48. int bytes_received = recv(client_fd, message, sizeof(message), 0);
49. if (bytes_received > 0) {
50. message[bytes_received] = '�'; // Null terminate received data
51. printf("Server: %sn", message);
52. } else {
53. if (bytes_received == 0) {
54. printf("Server disconnectedn");
55. } else {
56. perror("recv");
57. }
58. break;
59. }
60. } else {
61. printf("Invalid message formatn");
62. }
63. }
64. // Close connection
65. close(client_fd);
66. return 0;
67. }
68.