Conditional Operator (?:)

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Conditional Operator (?)

• Conditional operator (?) takes three arguments
  (ternary)
• Syntax for using the conditional operator
• expression1 ? expression2 expression3
• If expression1 is true, the result of the
  conditional expression is expression2. Otherwise,
  the result is expression3

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Conditional Operator (?)

• if(agtb)
• Maxa
• else
• Maxb
• Max(agtb)?ab

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• switch ( test )
• case 1 // Process for test 1 ...
• break
• case 5 // Process for test 5 ...
• break
• default // Process for all other cases.

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• switch works as follows-
• The expression, just test in this case, is
  evaluated.
• The case labels are checked in turn for the one
  that matches the value.
• If none matches, and the optional default label
  exists, it is selected,
• the break statement is normally added before the
  next case label to transfer control out of the
  switch statement.

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include ltiostreamgt using namespace std int
main() char grade cout ltlt "Enter your grade
" cin gtgt grade cout ltlt endl switch
(grade) case 'A' cout ltlt "Your grade is
A." ltlt endl break case 'B' cout ltlt "Your
grade is B." ltlt endl break case 'C'
cout ltlt "Your grade is C." ltlt
endl break case 'F' cout ltlt "Your grade
is F." ltlt endl break default coutltlt" The
grade is invalid."ltltendl return 0
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switch with break

• include ltiostreamgt
• using namespace std
• int main()
• Int place
• cout ltlt "Enter your place "
• cin gtgt place
• cout ltlt endl
• switch (place)
• case 1 cout ltlt "we're first" ltlt endl
• break
• case 2 cout ltlt "we're second" ltlt endl break
• default
• cout ltlt "we're not first or second" ltlt endl
• return 0

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switch with break

• include ltiostreamgt
• using namespace std
• int main()
• int place
• cout ltlt "Enter your place "
• cin gtgt place
• cout ltlt endl
• switch (place)
• case 1 cout ltlt "we're first" ltlt endl
• break
• case 2 cout ltlt "we're second" ltlt endl
• break
• default
• cout ltlt "we're not first or second" ltlt endl

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switch with break
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switch without break

• include ltiostreamgt
• using namespace std
• int main()
• int place
• cout ltlt "Enter your place "
• cin gtgt place
• cout ltlt endl
• switch (place)
• case 1 cout ltlt "we're first" ltlt endl
• case 2 cout ltlt "we're second" ltlt endl
• default
• cout ltlt "we're not first or second" ltlt endl

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What is the output

• include ltiostreamgt
• using namespace std
• int main()
• int place
• cout ltlt "Enter your place "
• cin gtgt place
• cout ltlt endl
• switch (place)
• case 1 cout ltlt "we're first" ltlt endl
• case 1 cout ltlt "we're second" ltlt endl
• default
• cout ltlt "we're not first or second" ltlt endl

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assert

• qn/d
• If d is 0,the program would terminate with error
  message stating that an illegal operation has
  occurred
• Solution
• assert(d)
• qn/d
• You need preprocessor directive includeltcassertgt
• Assert statement identifies the expression where
  assertion failed ,the name of file containing the
  source code ,and the line number where the
  assertion failed