diff --git a/client.c b/client.c
index ff24242..611a8cd 100644
--- a/client.c
+++ b/client.c
@@ -9,7 +9,7 @@
 #include <arpa/inet.h>
 #include <errno.h>
 #include <sys/stat.h>
-
+#include <stdbool.h>
 #include <assert.h>
 #include <fcntl.h>
 #include "socket_wrapper.h"
@@ -28,6 +28,7 @@ static const int TIMEOUT = 5;
 static const int TIMEOUT = DEFAULT_TIMEOUT;
 #endif
 
+static const int PROGRESS_BAR_WIDTH = 30;
 /*========
  *Operation
  *========*/
@@ -40,13 +41,43 @@ int sendReadOp(int sock,const char * filename){
         perror("readop send fail");
         return -1;
     }
+    #ifdef SLOW_CLIENT
+    sleep(SLOW_CLIENT);
+    #endif
     if(send(sock,filename,op.file_url_size,0)<0){
         perror("readop filename send fail");
         return -1;
     }
     return 0;
 }
-
+/** 
+ * @arg cur_progress : it is percentage.
+*/
+bool isProgressBarNeedUpdate(size_t offset,size_t total,double cur_progress){
+    return ((double)offset / (double)total) > (cur_progress / 100.0);
+}
+void DisplayProgressBar(size_t offset,size_t total,double cur_progress){
+    char buf[PROGRESS_BAR_WIDTH];
+    size_t i;
+    size_t cur_pos = (cur_progress / 100.0 * PROGRESS_BAR_WIDTH); //must be less than SIZE_MAX. other value is undefined behavior.
+    for (i = 0; i < PROGRESS_BAR_WIDTH; i++)
+    {
+        if (i < cur_pos)
+            buf[i] = '=';
+        else if(i == cur_pos)
+            buf[i] = '>';
+        else buf[i] = ' ';
+    }
+    printf("\r[%s]: %.2f%% bytes: %ld/%ld bytes",buf,cur_progress,total,offset);
+}
+void DisplayProgressBar100Percent(size_t total){
+    size_t i;
+    char buf[PROGRESS_BAR_WIDTH];
+    for (i = 0; i < PROGRESS_BAR_WIDTH; i++){
+        buf[i] = '=';
+    }
+    printf("\r[%s]: 100%% bytes: %ld/%ld bytes\n",buf,total,total);
+}
 int recvFile(int sock, const char * filename,size_t file_size){
     int fd;
     size_t count = 0;
@@ -80,14 +111,14 @@ int recvFile(int sock, const char * filename,size_t file_size){
             return_value = -1;
             goto END;
         }
-        if( ((double)count / (double)file_size) * 100.0 > ((double)cur_progress) ){
-            printf("\rprogress : %d%% current bytes: %ld bytes",cur_progress,count);
+        if( isProgressBarNeedUpdate(count,file_size,cur_progress) ){
+            DisplayProgressBar(count,file_size,cur_progress);
             cur_progress = (int)((((double)count / (double)file_size)) * 100.0 + 1.0);
             fflush(stdout);
         }
         count += readed;
     }
-    printf("\rprogress : 100.00%% current bytes: %ld bytes\n",count);
+    DisplayProgressBar100Percent(file_size);
 END:
     free(buf);
     return return_value;
@@ -130,7 +161,7 @@ int main(int argc, const char *argv[]){
     struct sockaddr_in addr;
     const char * filename;
     const char * server_name;
-    in_port_t server_port;
+    in_port_t server_port = 0;
     int sock, err;
     if (argc != 4){
         fprintf(stderr,"USAUE: %s SERVERNAME PORT FILENAME\n",argv[0]);
@@ -149,7 +180,7 @@ int main(int argc, const char *argv[]){
         perror("sock create fail");
         return 1;
     }
-    err = getsockaddrbyname(AF_INET,SOCK_STREAM,0,server_name,((struct sockaddr *)&addr));
+    err = getsockaddrbyname(AF_INET,SOCK_STREAM,0,server_name,(struct sockaddr *)&addr);
     if (err != 0){
         int check;
         fprintf(stderr,"netdb fail: %s\n",gai_strerror(err));
@@ -166,7 +197,6 @@ int main(int argc, const char *argv[]){
     addr.sin_port = htons(server_port);
     if(connect(sock,(struct sockaddr *)&addr,sizeof(addr)) < 0){
         perror("connect failed");
-        close(sock);
         return 1;
     }
     if(sendReadOp(sock,filename) == 0){
diff --git a/p-client.c b/p-client.c
index c01bc45..34f6cd3 100644
--- a/p-client.c
+++ b/p-client.c
@@ -9,9 +9,10 @@
 #include <arpa/inet.h>
 #include <errno.h>
 #include <sys/stat.h>
-
+#include <stdbool.h>
 #include <assert.h>
 #include <fcntl.h>
+
 #include "socket_wrapper.h"
 
 #ifdef USE_SENDFILE
@@ -27,6 +28,8 @@ static const int TIMEOUT = 5;
 #else
 static const int TIMEOUT = DEFAULT_TIMEOUT;
 #endif
+
+static const int PROGRESS_BAR_WIDTH = 30;
 /*========
  *Operation
  *========*/
@@ -48,12 +51,39 @@ int sendReadOp(int sock,const char * filename){
     }
     return 0;
 }
-
+/** 
+ * @arg cur_progress : it is percentage.
+*/
+bool isProgressBarNeedUpdate(size_t offset,size_t total,double cur_progress){
+    return ((double)offset / (double)total) > (cur_progress / 100.0);
+}
+void DisplayProgressBar(size_t offset,size_t total,double cur_progress){
+    char buf[PROGRESS_BAR_WIDTH];
+    size_t i;
+    size_t cur_pos = (cur_progress / 100.0 * PROGRESS_BAR_WIDTH); //must be less than SIZE_MAX. other value is undefined behavior.
+    for (i = 0; i < PROGRESS_BAR_WIDTH; i++)
+    {
+        if (i < cur_pos)
+            buf[i] = '=';
+        else if(i == cur_pos)
+            buf[i] = '>';
+        else buf[i] = ' ';
+    }
+    printf("\r[%s]: %.2f%% bytes: %ld/%ld bytes",buf,cur_progress,total,offset);
+}
+void DisplayProgressBar100Percent(size_t total){
+    size_t i;
+    char buf[PROGRESS_BAR_WIDTH];
+    for (i = 0; i < PROGRESS_BAR_WIDTH; i++){
+        buf[i] = '=';
+    }
+    printf("\r[%s]: 100%% bytes: %ld/%ld bytes\n",buf,total,total);
+}
 int recvFile(int sock, const char * filename,size_t file_size){
     int fd;
     size_t count = 0;
     int i;
-    int cur_progress = 1;
+    double cur_progress = 1;
     int return_value = 0;
     int buf_sz = getBufferSizeFrom(sock);
     uint8_t * buf = malloc(buf_sz*sizeof(*buf));
@@ -82,14 +112,14 @@ int recvFile(int sock, const char * filename,size_t file_size){
             return_value = -1;
             goto END;
         }
-        if( ((double)count / (double)file_size) * 100.0 > ((double)cur_progress) ){
-            printf("\rprogress : %d%% current bytes: %ld bytes",cur_progress,count);
+        if( isProgressBarNeedUpdate(count,file_size,cur_progress) ){
+            DisplayProgressBar(count,file_size,cur_progress);
             cur_progress = (int)((((double)count / (double)file_size)) * 100.0 + 1.0);
             fflush(stdout);
         }
         count += readed;
     }
-    printf("\rprogress : 100.00%% current bytes: %ld bytes\n",count);
+    DisplayProgressBar100Percent(file_size);
 END:
     free(buf);
     return return_value;