Pick random 3-characters string in C++

#include<iostream>
#include<stdlib.h>
using namespace std;
char intToAlphabet( int i )
{
   return static_cast<char>('A' - 1 + i);
}
int main()
{
    int n=0 , x;
    while(n<3)
    {
        x=rand() % 26 + 1;
        cout<<intToAlphabet(x);
        n=n+1;
    }
}