Algebraic Operator C Operator

1

• Algebraic Operator C Operator
• ? !
• Relational Operator C Relational
  Operator
• gt gt
• lt lt
• gt
• lt

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Datatypes

• Datatype Keyword Bytes
• integer short 1
• int 2
• long 4
• float float 4
• double 8

3
Type Casting

• The operator called a cast operator is used to
• convert from one data type to another.
• Example
• int a 15
• int b 16
• float c 0.0
• c ( float ) a / b
• The calculation a / b produces an integer result
  which is then converted to a float for an
  accurate solution.

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f

• f used to represent floats without
  specifying precision.
• Format
• a.b f
• b specifies the number of places after the
  decimal point (after rounding the result)
• a specifies the total field width
• (places before after the decimal point)

5
Selection structures

• A selection structure is used to choose among
  alternative courses of action.
• The if selection structure executes an
  indicated action only when the condition is
  true.
• The if selection structure expects only one
  statement in its body. To include several
  statements, enclose the set of statements in
  .
• Compound statement - The set of statements
  within

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• Format
• if (expression)
• statement
• A decision is made based on the expression. If
  the expression evaluates to zero, it is treated
  as false.
• If the expression evaluates to nonzero, it is
  treated as true.

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• Format
• if (expression)
• statement1
• statement2
• statementn

8

• Example
• if ( a b )
• printf(The two numbers are equal.\n)
• else
• printf(The two numbers are different.\n)

9

• Nested if/else structures test for different
  cases.
• Example
• if ( grade gt 90)
• printf( A \n)
• else if ( grade gt 80)
• printf( B \n)
• else if ( grade gt 70)
• printf( C \n)
• else if ( grade gt 60)
• printf( D \n)
• else
• printf(F \n)

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The while Repetition Structure

• A Repetition Structure allows the programmer to
  specify that an action is to be repeated while
  some condition remains true.
• Format
• while ( expression )
• statement
• The while structure body may be a single
  statement or a compound statement.
• The expression is tested each time through the
  loop. The statement is repeated until the
  expression remains true.

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• When the condition becomes false, the while
  condition is exited and control passes to the
  next statement in the program.
• Example
• Sum of the first 5 numbers
• j 1
• sum 0
• while ( j lt 5)
• sum sum j
• j j 1
• printf(sum is d \n, sum)

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Increment and Decrement Operators

• Unary increment operator
• Unary decrement operator --
• These operators are used when a variable is
  incremented or decremented by 1.
• Operator Example
• a
• a
• -- --b
• -- b--

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Conditional Operator

• Conditional operator ?
• The conditional operator takes three operands
  (ternary operator).
• Format
• condition ? Value if true Value if false
• Example
• choice number ! 3 ? 0 3