The program if the number is divisible by 2 numbers tells me only 1

Question

#include <stdio.h>
#include <iostream>
#include <math.h>
int main()
{
using namespace std;
//dichiarazione variabili
int a;

cout<<"Inserisci numero :";
cin>>a;
if (a%3==0)
cout<<"e' divisibile per 3 :";
else if (a%5==0)
cout<<"e divisibile per 5 :";
else if (a%7==0)
cout<<"e divisibile per 7 :";
else if (a%11==0)
cout<<"e divisibile per 11 :";
else if (a%13==0)
cout<<"e divisibile per 13 :";
else cout<<"il nume non e' divisibile per nessuno di questi numeri";

system("Pause");
}

Answer 1

What problem you are facing here. Clarify first.

Answer 2

Doesn't work
#include <stdio.h>
#include <iostream>
#include <math.h>
int main()
{
using namespace std;
//dichiarazione variabili
int a;

cout<<"Inserisci numero :";
cin>>a;
if (a%3==0) { is_divisible true; cout < "divisible by 3\n; }
if (a%5==0) { is_divisible true; cout < "divisible by 5\n; }
if (a%7==0) { is_divisible true; cout < "divisible by 7\n; }
if (a%11==0) { is_divisible true; cout < "divisible by 11\n; }
if (a%13==0) { is_divisible true; cout < "divisible by 13\n; }
if (! is_divisible) { cout < "not divisible\n; }

system("Pause");
}