Why is this returning false?

Question

So I have this check method that returns true if all the parameters are met, and returns false if not. My question is this... Why does (c <= 'a' && c >= 'z' || c == '/') equate to false when an input of:

fiddler 01010100 10011100 /ro ?

*Line is marked

public static bool check(string action)
{
    string[] arguments = action.Split(' ');
    if (arguments.Length > 3)
    {
        string[] time = { arguments[1], arguments[2] };
        for (int i = 1; i < time.Length; i++)
        {
            if (i == 1 || i == 2)
                foreach (char c in time[i])
                {
                    if (c >= '0' && c <= '9') { }
                    else return false;
                }
            else break;
        }
        for (int i = arguments.Length - 1; i >= 3; i--)
        {
            if (i != 1 || i != 2 && arguments[i] != "")
            {
                foreach (char c in arguments[i])
                {
     >>> >>> >>>    if (c <= 'a' && c >= 'z' || c == '/') { }
                    else return false;
                }
                if (arguments[i] == " " || arguments[i] == null || call.arguments.Contains(arguments[i]) == true) { }
                else return false;
            }
        }
    }
    else if (arguments.Length == 3)
    {
        for (int i = 1; i <= arguments.Length; i++)
        {
            if (i == 1 || i == 2)
            {
                foreach (char c in arguments[i])
                {
                    if (c >= '0' && c <= '9') { }
                    else return false;
                }
            }
            else
            {
                foreach (char c in arguments[i].ToUpper())
                {
                    if (c <= 'a' && c >= 'z' || c == '/') { }
                    else return false;
                }
                if (arguments[i] == " " || arguments[i] == null || call.arguments.Contains(arguments[i]) == true) { }
                else return false;
            }
        }
    }
    else return false;
    return true;
}

Answer 1

In your code, the expression is c <= 'a' && c >= 'z' They can't be both true, so it is always false. You probably mean to write c >= 'a' && c <= 'z'

Answer 2

Your code has so many errors.

Firstly, in this part of code:

string[] time = { arguments[1], arguments[2] };
for (int i = 1; i < time.Length; i++)
{
     if (i == 1 || i == 2)

i never be equal to 2, because (2 >= time.Length). You should use this:

for (int i = 0; i < time.Length; i++)

without any checking.

Secondly, this part:

for (int i = arguments.Length - 1; i >= 3; i--)
{
    if (i != 1 || i != 2 && arguments[i] != "")

i never be equal to 1 or 2, beacause this checking already been in for statement. You should remove this checking for clearing your code.

Thirdly, this check c <= 'a' && c >= 'z' is always false, because 'z' > 'a'. You probably should use this c >= 'a' && c <= 'z'.

Good luck and will be more careful!