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.
Combination Pills (COCs) 1  If you start combination pills within 5 days after your period starts, youâll be protected from pregnancy right away. 2  If you start combination pills any other time, youâll be protected from pregnancy after 7 days of taking the pill.