Dev - C++ - Validar el ingreso de un numero que sea multiplo de 5

#include<iostream>

#include<stdlib.h>

#include<math.h>

using namespace std;

int main(){

	int num;

	float raiz;

	repeat:

	cout<<" ingrese un numero "<<endl;

	cin>>num;

		raiz = (sqrt(num));

	if(num % 5 == 0){

		goto repeat;

	}

		cout<<"si  "<<raiz<<endl;

return 0;

}

#include <iostream>

#include <cmath>

using namespace std;

int main() {

  int num;

  float raiz;

  do {

    cout << "Ingrese un numero multiplo de 5: ";

    cin >> num;

  } while (num % 5 != 0);

  raiz = sqrt(num);

  cout << "\nLa raiz cuadrada de " << num << " es " << raiz << endl;

  return 0;

}