'H' or '&H' .
Hexadecimal uses the digits 0-9 and the letters a-f (in either upper case A-F, or lower case a-f). You appear to have used a letter O in upper case and lower case (o). Neither is a valid [standard] hexadecimal digit; so 3EO and 3Eo both mean the same in hexadecimal: a non-valid number. 3E0 and 3e0 are both valid hexadecimal numbers that mean the same (as the decimal number 992). In C, to signify a hexadecimal number it is preceded by 0X or 0x (that is zero-letter X), as in 0x3E0, etc.
Two preceded by seven is 72.
Fours are normally represented by the 5 unit preceded by a 1's unit to show 1 subtracted from 5. In this case xl represents 50 (L) minus 10 (X). The number here is 46.
Thousands are represented by an M and hundreds by a C. Fours are normally represented by the 5 unit (L=50 and V=5) preceded by a 1's unit (X=10 and I=1) to show 1 subtracted from 5. In this case the number would be MCMXLIV.
83 eighty three
In software, they're often preceded with "0x". Note that the first character there is a zero, not the letter O.For example:0x10 = 16 in decimal.Other common notations (outside of software) include:101610h
Hexadecimal uses the digits 0-9 and the letters a-f (in either upper case A-F, or lower case a-f). You appear to have used a letter O in upper case and lower case (o). Neither is a valid [standard] hexadecimal digit; so 3EO and 3Eo both mean the same in hexadecimal: a non-valid number. 3E0 and 3e0 are both valid hexadecimal numbers that mean the same (as the decimal number 992). In C, to signify a hexadecimal number it is preceded by 0X or 0x (that is zero-letter X), as in 0x3E0, etc.
The new line character ('\n') has the ASCII value 10 decimal, 0x0A hexadecimal. In some cases, a new line may be preceded with a carriage-return (ASCII 13 decimal, 0x0D hexadecimal), however the carriage return is only of relevance to line printers. To determine when the enter key is pressed, capture the character via stdin and test for equality with the '\n' character.
Herbert Hoover preceded Franklin Roosevelt.
The iPhone 5 was preceded by the iPhone 4S.
Elizabeth I was preceded by Mary I, her sister. Elizabeth II was preceded by George VI, her father.
John Tyler preceded Polk as US president.
Two preceded by seven is 72.
You would say "...is preceded..." if you note that fact at the person's time of death. "Was preceded" is how the obituary would be worded because it was written after the person's death. Both deaths would have happened in the past.
Thousands are represented by an M. Fours are normally represented by the 5 unit preceded by a 1's unit to show 1 subtracted from 5 (100 from 500 or C from D). In this case the number would be MMCDXI.
Neoclassicism preceded Romanticism.
Tornadoes are usually preceded by heavy rain and often by hail.