This function takes a single character input string and returns the Unicode (UTF8) value for that character. Note that when used with the keyboard_check* functions, the input string can only be one character in length and can only be a number from 0 to 9 or a capitalised Roman character from A to Z.
Argument Description string The string with which to find the Unicode code.
y -= 4;
This will move the calling instance four pixels upwards if the key W is held down.