Declaration

int isxdigit(int iChar);

Description

This function returns a non-zero int value to indicate true if the passed in value, iChar, is a hexidecimal digit in the ASCII table. Otherwise, the function returns zero. The ranges for which this function returns a non-zero result are [48, 57], [65, 70], and [97, 102].

Example

#include <iostream>
#include <cctype>

int main() {
    using namespace std;

    // Output the column headings
    cout << "    ";
    for (int iIndex = 0; iIndex < 16; ++iIndex) {
        if (iIndex < 10) {
            cout << " ";
        }
        cout << " " << iIndex;
    }
    cout << endl << endl;

    for (int iIndex = 0; iIndex < 256; ++iIndex) {
        // Output the row heading every 16 places
        if ((iIndex) % 16 == 0) {
            if (iIndex < 10) {
                cout << "  ";
            } else if (iIndex < 100) {
                cout << " ";
            }
            cout << iIndex << " ";
        }
        cout << "  " << (bool)isxdigit(iIndex);
        // Add an endline every 16 characters
        if ((iIndex) % 16 == 15) {
            cout << endl;
        }
    }
    return 0;
}

Output