Sha256: 0e02088fc128a14dd85d88bdcaeb607a11e80a12e7be0c93b970807b337b564d
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Size: 1.62 KB
Versions: 10
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Stored size: 1.62 KB
Contents
# Operator Precedence
#
# If you don't explicitly state the order in which
# an expression is evaluated, they are evaluated based
# on the operator precedence. For example, in the statement
# "4+2*8", the 2 will first be multiplied by 8 and then the result will
# be added to 4. This is because the "*" has a higher precedence
# than the "+". To avoid ambiguity in reading the program,
# it is recommended that is statement is written as "4+(2*8)".
# The order of evaluation can be controlled through placement of
# parenthesis in the code. A table of operator precedence follows below.
# The highest precedence is at the top of the list and
# the lowest is at the bottom.
# Multiplicative: * / %
# Additive: + -
# Relational: < > <= >=
# Equality: == !=
# Logical AND: &&
# Logical OR: ||
# Assignment: = += -= *= /= %=
size 640, 360
background 51
no_fill
stroke 204
(0...(width-20)).step(4) do |i|
# The 30 is added to 70 and then evaluated
# if it is greater than the current value of "i"
# For clarity, write as "if i > (30 + 70))"
line i, 0, i, 50 if i > 30 + 70
end
stroke 255
# The 2 is multiplied by the 8 and the result is added to the 4
# For clarity, write as "rect 4 + (2 * 8), 52, 90, 48"
rect( 4 + 2 * 8, 52, 290, 48 )
rect( (4 + 2) * 8, 100, 290, 49 )
stroke 153
(0...width).step(2) do |i|
# The relational statements are evaluated
# first, and then the logical AND statements and
# finally the logical OR. For clarity, write as:
# "if ((i > 20) && (i < 50)) || ((i > 100) && (i < 180))"
line i, 151, i, height-1 if i > 20 && i < 50 || i > 100 && i < width-20
end
Version data entries
10 entries across 10 versions & 1 rubygems