A string that converts a number into a 16-digit representation.

To convert a number to a 16-digit string, we can call sprintf, but the standard library of C does not provide a function that converts a hexadecimal string number to an integer number. I've written a feature that can be implemented and optimized as much as possible.
    (Currently this function only supports 32-bit)/* input hex string, format:0xaa111 or AA111 or abc11/int ahextoi (char* p) {int n = 0;

    char* q = p;

    /* Reach's Tail/while (*Q) q++;

    if (*p = = ' 0 ' && * (P + 1)!= 0)/* skip "0x" or "0X" * * + + 2;
        while (*p) {int C;
        if (*p >= ' 0 ' && *p <= ' 9 ') c = *p-' 0 ';
        else if (*p >= ' a ' && *p <= ' F ') c = *p-' a ' + 0xA;
        else if (*p >= ' a ' && *p <= ' f ') c = *p-' a ' + 0xA;

        else/* Invalid char */return 0;
        n + + C << ((int) (Q-P-1) * 4);
    p++;
} return N;

    You can test with the following code: int main (int argc, char* argv[]) {int out = 0;

    out = Ahextoi ("");

    printf ("% #010X/n", out);

    out = Ahextoi ("0x123");

    printf ("% #010X/n", out); Out = Ahextoi ("123abc");

    printf ("% #010X/n", out);

    out = Ahextoi ("ABC123");

    printf ("% #010X/n", out);

    out = Ahextoi ("0xac1b1c");

    printf ("% #010X/n", out);

return 0;
 }