diff --git a/cpp/.gitignore b/cpp/.gitignore
new file mode 100644
index 0000000..600d2d3
--- /dev/null
+++ b/cpp/.gitignore
@@ -0,0 +1 @@
+.vscode
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diff --git a/cpp/test.cpp b/cpp/test.cpp
new file mode 100644
index 0000000..c52986a
--- /dev/null
+++ b/cpp/test.cpp
@@ -0,0 +1,33 @@
+#include <iostream>
+#include <string>
+using namespace std;
+class Solution {
+public:
+    string replaceSpace(string s) {
+        int count = 0;
+        int lenth = s.size();
+        for(auto i = 0; i < lenth; ++i){
+            if(s[i] == ' '){
+                count = count + 1;
+            }
+        }        
+        s.resize(s.size() + 2 * count);
+        for(int i = lenth - 1, j = s.size() - 1; i < j; --i, --j){
+            if (s[i] != ' ')
+                s[j] = s[i];
+            else {
+                s[j - 2] = '%';
+                s[j - 1] = '2';
+                s[j] = '0';
+                j -= 2;
+            }
+        }
+        return s;
+    }
+};
+
+int main(){
+    string s = "We are happy.";
+    Solution test;
+    cout<<test.replaceSpace(s)<<endl;
+}
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