diff --git a/260321/100以内的素数.cpp b/260321/100以内的素数.cpp
new file mode 100644
index 0000000..50f02e6
--- /dev/null
+++ b/260321/100以内的素数.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    for (int n = 2; n <= 100; n++) {
+        bool x = true;
+        // i*i <=n因数是成对出现的任何一个合数 ，都可以写成两个数相乘：
+        //n = a * b
+        //比如 n = 16，它的因数对有：
+        //2 * 8 = 16
+        //4 * 4 = 16
+        //8 * 2 = 16
+        
+        for (int i = 2; i * i <= n; i++) {
+            if (n % i == 0) {
+                x = false;
+                break;
+            }
+        }
+
+        if (x) {
+            cout << n << " ";
+        }
+    }
+    return 0;
+}
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