Question

I have to iterate through all alphanumeric characters, including lower case and upper case and numbers and for each one, I have to call the crypt command.

So, I have to check for Aa, aA, 1a, a1, 1A, A1 etc till all possible combinations and call crypt KEY crypt_file.

Is there an efficient way to do this?

Thanks

Answer 1

You can put the characters into an array. Something like:

const char vals[] = { '0', '1', '2', ..., 'a', 'b', ... 'Z' }; // Probably better to generate it programatically

A double “for” loop should do it:

int i;
for (i = 0; i < kNumVals; i++) // kNumVals is the number of characters in your array
{
    int j;
    for (j = 0; j < kNumVals; j++)
    {
        char myString[3] = {vals[i],vals[j],'\0'};
        // Do something with myString
    }
}