Problem with kbhit() or getch()

//word = "Hello";
//Funtion is working fine but when I press a key it doesnot enter if(kbhit()) loop.
//Moreover, I tried _getch() next to "if" loop statement but _getch() is also not working :(
void Game::Print_LetterBox(int x,int y,char* word)
{
    int size = strlen(word);
    char key;

    if(_kbhit())
    {
        key = _getch();
    }
    for(int i=0;i<size;i++)
    {
        Letter_Box( word[i],x + i*34,y,"purple");
        for(int j=0;j&lt;size;j++)
        {
            if(word[j] == key)
                Letter_Box( word[i],x+i*34,y,"red");
        }
    }
    Animated_Character( x + size*34, 540 , 5);
}