diff --git a/2224020147/chapter1/exp.1_1.cpp b/2224020147/chapter1/exp.1_1.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..eb0ddd9c47ed7819ede02b72833ffd9bda49f6c9
--- /dev/null
+++ b/2224020147/chapter1/exp.1_1.cpp
@@ -0,0 +1,53 @@
+//文件名：exp1-1.cpp
+#include <stdio.h>
+#include <time.h>		 	//clock_t, clock, CLOCKS_PER_SEC
+#include <math.h>
+
+//------方法1-----------------------------------------------
+long add1(long n)			//方法1：求1+2+...+n
+{
+	long i,sum=0;
+	for (i=1;i<=n;i++)
+		sum+=i;
+	return sum;
+}
+
+void AddTime1(long n)		//采用方法1的耗时统计
+{
+	clock_t t;
+	long sum;
+	t=clock();
+	sum=add1(n);
+	t=clock()-t;
+	printf("方法1:\n");
+	printf("  结果:1～%d之和:%ld\n",n,sum);
+	printf("  用时:%lf秒\n" ,((float)t)/CLOCKS_PER_SEC);
+}
+
+//------方法2-----------------------------------------------
+long add2(long n)			//方法2：求1+2+...+n
+{
+	return n*(n+1)/2;
+}
+void AddTime2(long n)		//采用方法2的耗时统计
+{
+	clock_t t;
+	long sum;
+	t=clock();
+	sum=add2(n);
+	t=clock()-t;
+	printf("方法2:\n");
+	printf("  结果:1～%d之和:%ld\n",n,sum);
+	printf("  用时:%lf秒\n" ,((float)t)/CLOCKS_PER_SEC);
+}
+//------------------------------------------------------------
+int main()
+{
+	int n;
+	printf("n(大于1000000):");
+	scanf("%d",&n);
+	if (n<1000000) return 0;
+	AddTime1(n);
+	AddTime2(n);
+	return 1;
+}