c++--2828: Prime Judgment

Description
Enter a positive integer greater than 1 and, if it is a prime number, output "yes", or "no" if it is not a prime number,

Input
A positive integer greater than 1

Output
Output "Yes" if the integer is a prime number, or "No" if not a prime number

/* Copyright (c) 2014, Yantai University School of Computer * All rights reserved. * File name: Test.cpp * Chen Dani * Completion date: May 20, 2015 * Version number: v1.0 * * #include <iostream> #include <cmath>using namespace Std;int is_prime (int n) {    int r;    if (n==1)        return 0;    else    {for        (r=2; r<=sqrt (n), ++r)            if (n%r==0) break                ;        if (R>SQRT (n))            return 1;}    } int main () {    int flag,n;    int is_prime (int);    cin>>n;    Flag=is_prime (n);    if (flag==1)        cout<< "yes" <<endl;    else        cout<< "No" <<endl;    return 0;}

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c++--2828: Prime Judgment