c2.2 p30 PRACTICE!

Determine which of the following names are valid identifiers. If a name
is not a valid identifier, give the reason that it is not acceptable,
and suggest a valid replacement.

    1: density
    2: area
    3: Time
    4: xsum
    5: x_sum
    6: tax-rate
    7: perimeter
    8: sec^2
    9: degrees_C
    10: break
    11: #123
    12: x&y
    13: count
    14: void
    15: f(x)
    16: f2
    17: Final_Value
    18: w1.1
    19: reference1
    20: reference_1
    21: m/s

c2.2 p31 PRACTICE!

In Problems 1 through 6, express the value in scientific notation.

    1.  35.004
    2.  0.00042
    3.  -50,000
    4.  3.15723
    5.  -0.0999
    6.  10,000,002.8

In Problems 7 through 12, express the value in floating-point notation.

    7.  1.03e-5
    8.  -1.05e5
    9.  -3.552e6
    10.  6.67e-4
    11.  9.0e-2
    12.  -2.2e-2

c2.2 p35 PRACTICE!

Give the preprocessor directives to assign symbolic constants for these
constants:

    1: Speed of light, c = 2.99792 x 108 m/s
    2: Charge of an electron, e = 1.602177 x 10-19 C
    3: Avogadro's number, N_A = 6.022 x 1023 mol-1
    4: Acceleration of gravity, g = 9.8 m/s2
    5: Acceleration of gravity, g = 32 ft/s2
    6: Mass of the Earth, M_E = 5.98 x 1024 kg
    7: Radius of the Moon, r = 1.74 x 106 m
    8: Unit of length, Unit_Length = 'm'
    9: Unit of time, Unit_Time = 's'