32 lines
648 B
C++
32 lines
648 B
C++
#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;
|
|
} |