[AbyssMorgan]

Код:

isEmail(email[])
{
    if (!email[0]) return false;
 
    new
        len = strlen(email),
        arroba = 0,
        ponto = 0;
 
    for(arroba = 0 ; arroba < len; arroba++) {
        if(!(email[arroba] - 64)) {
            for( ponto = arroba; ponto < len; ponto++) {
                if(!(email[ponto] - 46)) {
                    break;
                }
            }
            break;
        }
    }
    return (arroba + 1 < ponto < len && ponto && arroba); //not fixed
}

syntax looks 'for' incorrectly

or
return (arroba + 1 < ponto < len && ponto && arroba);

should return data type -inf, ..., -1, 0, 1, 2, ..., inf or "a", "abc"

and with you it looks like the condition "if"