Added server code

server.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+#include <string.h>
+
+int main(){
+	int s = 0;
+
+	if((s = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		perror("socket error");
+	}
+
+	struct sockaddr_in s_addr;
+
+	int opt = 1;
+
+	setsockopt(s, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt));
+
+	s_addr.sin_family = AF_INET;
+	s_addr.sin_port = htons(8080);
+	s_addr.sin_addr.s_addr = INADDR_ANY;
+
+	if( bind(s, (struct sockaddr *)&s_addr, sizeof(s_addr)) < 0){
+		perror("bind error");
+		exit(1);
+	}
+while(1){
+	if(listen(s, 3) < 0){
+		perror("listen error");
+	}
+
+	int c_sock = 0;
+	int addrlen = sizeof(s_addr);
+
+	if((c_sock = accept(s, (struct sockaddr *)&s_addr, (socklen_t*)&addrlen)) < 0 ){
+		perror("accept error");
+		exit(-1);
+	}
+
+	char temp[256];
+
+	recv(c_sock, &temp, 256, 0);
+	int num_1 = atoi(temp);
+
+	recv(c_sock, &temp, 256, 0);
+	int num_2 = atoi(temp);
+
+	recv(c_sock, &temp, 256, 0);
+	int num_3 = atoi(temp);
+
+	char *response;
+
+	if((num_1+num_2) == num_3){
+		response = "correct";
+	}
+	else{
+		response = "incorrect";
+		num_3 = num_1+num_2;
+		sprintf(temp, "%d", num_3);
+	}
+
+	send(c_sock, response, 256, 0);
+	send(c_sock, temp, 256, 0);
+}
+
+	close(s);
+
+	return 0;
+}