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Ok... So I had a silly idea and tried putting the value 0123 into an int, just curious to see what would happen, I assumed that when I printed the value I'd get 123, but instead I got 83... Any ideas why? what happens inside the compiler/memory that makes this value become 83?
I tried this in C++ and C with GCC compiler and also tried with a float which yielded the same results.
501
A numeric constant consists of numerals, an optional leading sign, and an optional decimal point. Examples of valid numeric constants are: 5.0, 6, -5. Examples of invalid numeric constants are: 1-, 1A, 3.. 4. Numeric constants have a maximum length of 20 characters.
Character constants, real constants, and integer constants, etc., are types of primary constants.
Integer constant in C is a data type that is represented by const int . const int is capable of storing an integer in decimal, octal, and hexadecimal bases. The value to const int is assigned only when it is declared and cannot be changed afterward.
The C Standard defines octal constants as a 0 followed by octal digits (0 1 2 3 4 5 6 7). Programming errors can occur when decimal values are mistakenly specified as octal constants.
In C/C++ a numeric literal prefixed with a '0' is octal (base 8).
See http://www.cplusplus.com/doc/tutorial/constants/
120
Congratulations! You've discovered octal.
40
This is because any number starting with 0 like this is considered to be in octal (base 8) not decimal.
Same thing if you start with 0x you will get hexadecimal
44
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