From 530fdab17508cbc3b1e49d622eaa120bc3c9f502 Mon Sep 17 00:00:00 2001
From: zh <2088376133@qq.com>
Date: Tue, 19 Sep 2023 09:15:30 +0000
Subject: [PATCH] add chaoter_1.3cpp.

Signed-off-by: zh <2088376133@qq.com>
---
 chaoter_1.3cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 chaoter_1.3cpp

diff --git a/chaoter_1.3cpp b/chaoter_1.3cpp
new file mode 100644
index 00000000..ddde8564
--- /dev/null
+++ b/chaoter_1.3cpp
@@ -0,0 +1,20 @@
+//求出1~n中素数的个数
+#include <stdio.h>
+#include <math.h>
+void main(){
+    int m; 
+    int i;  
+    int k;   
+    printf("输入一个整数：");
+    scanf("%d",&m);
+    k=(int)sqrt( (double)m );
+    for(i=1;i<=k;i++)
+        if(m%i==0)
+            break;
+    if(i>k)
+        printf("%d是素数。\n",m);
+    else
+        printf("%d不是素数。\n",m);
+ 
+    return 0;
+}
\ No newline at end of file
-- 
Gitee