client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 12345

int main() {
    int sockfd;
    struct sockaddr_in server_addr;
    int number, result;

    // Create socket
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // Initialize server address struct
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // Change to your server IP address

    printf("Enter the number: ");
    scanf("%d", &number);
    if (sendto(sockfd, &number, sizeof(number), 0, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("sendto");
        exit(EXIT_FAILURE);
    }

    printf("Number sent to server: %d\n", number);

    // Close the socket
    close(sockfd);

    return 0;
}