'commit'

TangDou/LuoGuBook/L4_14.cpp

@@ -0,0 +1,32 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+//是不是质数
+bool IsPrime(int n) {
+    for (int i = 2; i <= n / i; i++)
+        if (n % i == 0)return false;
+    return true;
+}
+
+//是不是回文数
+bool isHuiWen(int n) {
+    int i = n;
+    int m = 0;
+    while (i) {
+        m = m * 10 + i % 10;
+        i /= 10;
+    }
+    return m == n;
+}
+
+int main() {
+    //定义输出文件
+    //ofstream out("../LuoGuBook/L4_14.txt");
+    ofstream out("c:/L4_14.txt");
+    for (int i = 2; i <= 100000000; i++)
+        if (IsPrime(i) && isHuiWen(i)) out << i <<",";
+    //关闭输出文件
+    out.close();
+    return 0;
+}