diff --git a/ch03/exercise3_22.cpp b/ch03/exercise3_22.cpp
index e88faf3..3fe16a9 100644
--- a/ch03/exercise3_22.cpp
+++ b/ch03/exercise3_22.cpp
@@ -1,28 +1,23 @@
-#include <iostream>
+#修改之前那个输出text第一段的程序，首先把text的第一段全都改成大写形式，然后再输出它。
+
 #include <vector>
-#include <cctype>
+#include <iterator>
 #include <string>
+#include <iostream>
 
 using namespace std;
 
 int main()
 {
-	vector<string> text;
-	text.push_back("aaaaaaaaaa aaaaaaaaa aaaaaa");
-	text.push_back("");
-	text.push_back("bbbbbbbbbbbbbb bbbbbbbbbbb bbbbbbbbbbbbb");
-
+	vector<string>text;
+	text.push_back("aaa bbb ccc ddd eee fff");
 	for (auto it = text.begin(); it != text.end() && !it->empty(); ++it)
 	{
-		for (auto &c : *it)
-		{
-			if (isalpha(c)) c = toupper(c);
-		}
+		for (auto it2 = it->begin(); !isspace(*it2); ++it2)
+			if (isalpha(*it2))
+				*it2 = toupper(*it2);
 	}
-
 	for (auto it : text)
-	{
 		cout << it << endl;
-	}
 	return 0;
-}
\ No newline at end of file
+}