f0208.cpp 判断一个数是否是素数

//====================== //f0208.cpp //判断一个数是否是素数 //===================== #include<iostream> #include<cmath> using namespace std; //--------------------- bool isPrime(int m); //--------------------- bool isPrime(int m) { double sqrtm = sqrt(m * 1.0); for(int i = 2;i <= sqrtm;i++) if(m % i == 0) return 0; return 1; } int main() { cout << "plsease input a number:"<<endl; int m; cin >> m; if(isPrime(m)) cout << m << " is a prime." <<endl; else cout << m << " is not a prime." <<endl; return 0; }