C Programming Course Notes - Data Types

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For each of the constants in the following table, indicate whether the constant is legal or illegal, what type of constant it is if legal, and why illegal otherwise:

Constant

Legal?

Explanation

486

Yes

Decimal int

98.6

Yes

Double

98.6f

Yes

Float - The f indicates float, as opposed to double.

02.479

No

No decimal allowed in an octal constant

0.2479

Yes

Double

"A"

Yes

Character string - Two chars including the null byte.

'A'

Yes

A single char. No null byte.

'ABC'

No

Single quotes are for single chars only

'\n'

Yes

The escape sequence represents a single newline character

000042

Yes

Octal. 4 * 8 + 2 = 34 in decimal

0ffH

No

No 'f' in octal. ( Resembles an old FORTRAN format. )

0xC2F9

Yes

Hexadecimal

+37.1

Yes

Double

.0000

Yes

Double

0xFLU

Yes

Hexidecimal. Value = 15, long, unsigned

0x48.6

No

No decimal point allowed in hexidecimal

0x486e1

Yes

'e' is a valid hexidecimal digit

486e1

Yes

Double. 486 * 10^1 = 4860

0486e1

No

No 'e' allowed in octal

0486

No

No '8' allowed in octal either. :-)

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