简易的C/S系统(实现两个数的和)-优快云博客

本文介绍了一个简单的客户端-服务器程序示例，该程序使用 C 语言实现，客户端发送两个整数到服务器，服务器计算这两个整数的和并返回结果。

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//Client:
#include <string.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>

int main(int argc, char **argv){
        int sockfd;
        struct sockaddr_in address;
        int result;
        int num1 = 25, num2 = 30, num3 = 0;
        printf("请输入两个整数");
        scanf("%d%d", &num1, &num2);
        sockfd = socket(AF_INET,SOCK_STREAM, 0);
        address.sin_family = AF_INET;
        address.sin_addr.s_addr = inet_addr("127.0.0.1");
        address.sin_port = 6666;
        result = connect(sockfd, (struct sockaddr *) &address, sizeof(address));
        if(result == -1){
                perror("连接失败了");
                return 1;
        }
        write(sockfd, &num1, sizeof(num1));
        write(sockfd, &num2, sizeof(num2));
        read(sockfd, &num3, sizeof(num3));
        printf("两个数的和是%d\n", num3);
        close(sockfd);
        return 0;
}

//Server
include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<netinet/in.h>

int main(int argc, int **argv){
        int server_sockfd, client_sockfd;
        struct sockaddr_in server_address;
        struct sockaddr_in client_address;
        //struct sockaddr_in *client_address2;
        server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
        server_address.sin_family = AF_INET;
        server_address.sin_addr.s_addr = inet_addr("127.0.0.1");
        server_address.sin_port = 6666;
        bind(server_sockfd, (struct sockaddr *) &server_address, sizeof(server_address));
        listen(server_sockfd, 10);
        int client_len;
        //char client_ip[100], client_port[100];
        while(1){
                int num1, num2, num3;
                printf("服务器等待消息\n");
                client_len = sizeof(client_address);
                client_sockfd = accept(server_sockfd, (struct sockaddr *) &client_address, (socklen_t *__restrict) &client_len);
                //sprintf(client_ip, inet_ntoa(client_address.sin_addr));
                //client_address2 = (struct sockaddr_in *)&client_address;
                //printf("你所连接的主机的ip地址为: %s, 端口号是：\n", inet_ntoa(client_address2->sin_addr));
                read(client_sockfd, &num1, sizeof(num1));
                printf("第一个数是: %d\n", num1);
                read(client_sockfd, &num2, sizeof(num2));
                printf("第二个数是: %d\n", num2);
                num3 = num1 + num2;
                write(client_sockfd, &num3, sizeof(num3));
                close(client_sockfd);
        }
        return 0;
}