To represent a negative number as a literal, prepend a minus sign (-) to the literal, as in -45. If you need to use a literal integer with octal numbering, prepend a 0 to the number. For example, the octal number 777 would be the literal 0777. Hexadecimal integers are used as literals by prepending the number with 0x, as in 0x12 or 0xFF. NOTE. Octal and hexadecimal numbering systems are convenient for many advanced programming uses, but unlikely to be needed by beginners.
To skip a period: 1  When taking monophasic birth control pills:  28-day oral contraceptive (OC) pack users: When you reach the end of the active hormonal pills in a pack (the first 21 or 24 pills), begin the next set of active pills, skipping the inactive (placebo pills) from the previous package.
if you take a combined contraceptive pill you can delay your period by taking two packets back to back how you do this will depend on which pill you take for example monophasic 21 day pill you take a combined pill for 21 days followed by seven days without pills when you have a bleedee your gp for advice if you want to delay your period and you are not taking the combined contraceptive pill they may be able to prescribe medication called norethisterone to delay your period