elsif
Statements in Ruby
In Ruby, an elsif
statement can be placed between if
and else
statements. It allows us to check for additional conditions.
More than one elsif
can be placed between if
and else
.
print "enter a number: "
num = gets.chomp
num = num.to_i;
if num == 5
print "number is 5"
elsif num == 10
print "number is 10"
elsif num == 11
print "number is 11"
else
print "number is something other than 5, 10, or 11"
end
Ruby not Operator
The !
(not) operator in Ruby flips a boolean value. If a value is true
then applying !
to the value changes it to false
and vice versa.
Else statement in Ruby.
In Ruby, an if
statement evaluates to either true
or false
. The code indented after the if
portion is executed for true
while the code indented after the else
portion is executed for false
.
if number > 50
print "number is greater than 50"
else
print "number is not greater than 50"
end
Comparison operators in Ruby.
The following comparison or relational operators are used in Ruby to compare values.
>
- greater than;
<
- less than;
>=
- greater than or equal to;
<=
- less than or equal to;
==
- equal to
Or operator in Ruby.
The ||
(or) operator is a logical operator which returns true
if either of the expressions on left-hand side or right-hand side is true
.
grade1 = 50
grade2 = 30
grade3 = 80
if grade1 > grade2 || grade1 > grade3
puts "Grade 1 is not the lowest score!"
end
if
Statement in Ruby
An if
statement in Ruby evaluates an expression, which returns either true
or false
. If the expression is true
, Ruby executes the code block that follows the if
whereas if the expression is false
, Ruby returns nil.
In this example, the string "Your condition was true!"
will print because the condition number == 10
is true.
number = 10
if number == 10
puts "Your condition was true!"
end
And operator in Ruby.
&&
is a logical operator in Ruby which evaluates to true
only if both expressions on either side of &&
evaluates to true
.
if score1 > score2 && score1 > score3
print "Score 1 is the greatest in value."
else
print "Score 1 is not the greatest in value."
end
Unless statement in Ruby.
An unless
statement in Ruby is used to evaluate an expression. If the expression evaluates to false
, then the code following unless
is executed.
#This construct requires a "number" variable to be less than 10 in order to execute:
print "Enter a number"
number = gets.to_i
unless number > 10
puts "number is less than 10."
end