diff --git a/problems/kamacoder/0055.右旋字符串.md b/problems/kamacoder/0055.右旋字符串.md
index 71371860..22be955f 100644
--- a/problems/kamacoder/0055.右旋字符串.md
+++ b/problems/kamacoder/0055.右旋字符串.md
@@ -253,6 +253,47 @@ func main(){
 ```
 
 
+### C：
+```C
+#include <stdio.h>
+#include <string.h>
+
+void reverse(char *s, int left, int right)
+{
+    while(left <= right)
+    {
+        char c = s[left];
+        s[left] = s[right];
+        s[right] = c;
+        left++;
+        right--;
+    }
+}
+
+void rightRotate(char *s, int k)
+{
+    int len = strlen(s);
+    // 先局部反转再整体反转
+    reverse(s, 0, len - k - 1);   // 反转前部分
+    reverse(s, len - k, len - 1); // 反转后部分：后k位
+    reverse(s, 0, len - 1);       // 整体反转
+}
+
+int main()
+{
+
+    int k;
+    scanf("%d", &k);
+    char s[10000];
+    scanf("%s", s);
+
+    rightRotate(s, k);
+    printf("%s\n", s);
+
+    return 0;
+}
+```
+
 ### JavaScript：