Possible format values:

• %% - Returns a percent sign
• %b - Binary number
• %c - The character according to the ASCII value
• %d - Signed decimal number
• %e - Scientific notation (e.g. 1.2e+2)
• %u - Unsigned decimal number
• %f - Floating-point number (local settings aware)
• %F - Floating-point number (not local settings aware)
• %o - Octal number
• %s - String
• %x - Hexadecimal number (lowercase letters)
• %X - Hexadecimal number (uppercase letters)

Additional format values. These are placed between the % and the letter (example %.2f):

• + (Forces both + and - in front of numbers. By default, only negative numbers are marked)
• ' (Specifies what to use as padding. Default is space. Must be used together with the width specifier. Example: %'x20s (this uses "x" as padding)
• - (Left-justifies the variable value)
• [0-9] (Specifies the minimum width held of to the variable value)
• .[0-9] (Specifies the number of decimal digits or maximum string length)

Note: If multiple additional format values are used, they must be in the same order as above.