diff --git a/冒泡、选择、插入排序.md b/冒泡、选择、插入排序.md
index e39dbce..b35b878 100644
--- a/冒泡、选择、插入排序.md
+++ b/冒泡、选择、插入排序.md
@@ -38,6 +38,41 @@ int main(){
 
 ### 选择排序
 
+```c
+#include <stdio.h>
+
+void selectSort(int *a, int n, int flag){
+	int i, j, t;
+	for(i=0;i<n-1;i++){
+		for(j=i;j<n;j++){
+			if(flag > 0?a[i] > a[j]:a[i] < a[j]){
+				t = a[i];
+				a[i] = a[j];
+				a[j] = t;
+			}
+		}
+	}
+}
+
+void printArray(int *a, int n){
+	int i;
+	for(i=0;i<n;i++){
+		printf("%d ", a[i]);
+	}
+	printf("\n");
+}
+
+int main(){
+	int a[] = {100, 1, 3, 2, 9, -1, 20, 30, 10, 50};
+	int n = sizeof(a)/4;
+	selectSort(a, n, 0);
+	printArray(a, n);
+
+	return 0;
+}
+
+```
+
 
 
 ### 插入排序
\ No newline at end of file