C++ Extended Ascii characters

Question

How to detect the presence of Extended ASCII values (128 to 255) in a C++ character array.

Answer 1

Iterate over array and check that each character doesn't fall in 128 to 255 range?

Answer 2

bool detect(const signed char* x) {
  while (*x++ > 0);
  return x[-1];
}

Answer 3

Check the values that they are not negative

Answer 4

Make sure you know the endianness of the machine in question, and just check the highest bit with a bitwise AND mask:

if (ch & 128) {
  // high bit is set
} else {
  // looks like a 7-bit value
}

But there are probably locale functions you should be using for this. Better yet, KNOW what character encoding data is coming in as. Trying to guess it is like trying to guess the format of data going into your database fields. It might go in, but garbage in, garbage out.

Answer 5

(char) c = (char) 200;

if (isascii(c))
{
    cout << "it's ascii!" << endl;
}
else
{
    cout << "it's not ascii!" << endl;
}

try this code

Answer 6

Doesn't anyone use isascii anymore?

char c = (char) 200;

if (isascii(c))
{
    cout << "it's ascii!" << endl;
}
else
{
    cout << "it's not ascii!" << endl;
}