Assignment

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Assignment 11

• Noorisha Nawaz

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Problem 14.12

• Random access files

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Flow Chart
start
Create file
Input data
Delete file
choose file
update file
choose file
end
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PSEUDOCODE

•  
• Level 1.0
• Input
• Process
• Output
•  
• Level 2.0
• Input
•  
• Create file
• Input data
•  
• Process
• If
• Delete file
• Then
• Choose file to delete
• Else
• Go to update file

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Source Code Page 1
//Solution to excercise 14.12 include
ltiostream.hgt include ltfstream.hgt include
ltiomanip.hgt include ltstring.hgt include
ltctype.hgt include ltstdlib.hgt void
initializeFile( fstream ) void inputData(
fstream ) void listTools( fstream ) void
updateRecord( fstream ) void insertRecord(
fstream ) void deleteRecord( fstream ) int
instructions( void ) const int LENGTH
30 struct Data int partNumber char
toolName LENGTH int inStock double
unitPrice int main() int choice
char response fstream file( "hardware.dat",
iosin iosout ) void ( f )( fstream
) listTools, updateRecord, insertRecord,
deleteRecord

• if ( !file )
• cerr ltlt "File could not be opened.\n"
• exit( EXIT_FAILURE )
• cout ltlt "Should the file be initialized (Y or
  N) "
• cin gtgt response
• while ( toupper( response ) ! 'Y' toupper(
  response ) ! 'N' )
• cout ltlt "Invalid response. Enter Y or N "
• cin gtgt response
• if ( toupper( response ) 'Y' )
• initializeFile( file )
• inputData( file )
• while ( ( choice instructions() ) ! 5 )
• ( f choice - 1 )( file )

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Source Code Page 2

• Data blankItem -1, "", 0, 0.0
• // See Chapter 21 for a discussion of
  reinterpret_cast
• for ( int i 0 i lt 100 i )
• fRef.write( reinterpret_castlt char gt(
  blankItem ), sizeof( Data ) )
• void inputData( fstream fRef )
• Data temp
• cout ltlt "Enter the partnumber (0 - 99, -1 to
  end input) "
• cin gtgt temp.partNumber
• while ( temp.partNumber ! -1 )
• cout ltlt "Enter the tool name "
• cin.ignore() // ignore the newline on the
  input stream
• cin.get( temp.toolName, LENGTH )
• cout ltlt "Enter quantity and price "

• cout ltlt "Enter the partnumber (0 - 99, -1 to end
  input) "
• cin gtgt temp.partNumber
• int instructions( void )
• int choice
• cout ltlt "\nEnter a choice\n1 List all
  tools."
• ltlt "\n2 Update record.\n3 Insert
  record."
• ltlt "\n4 Delete record.\n5 End
  program.\n"
• do
• cout ltlt "? "
• cin gtgt choice
• while ( choice lt 1 choice gt 5 )
• return choice

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Source Code Page 3

• cout ltlt setw( 7 ) ltlt "Record" ltlt " " ltlt
  setiosflags( iosleft )
• ltlt setw( 30 ) ltlt "Tool name" ltlt
  resetiosflags( iosleft )
• ltlt setw( 13 ) ltlt "Quantity" ltlt setw( 10 )
  ltlt "Cost\n"
• for ( int count 0 count lt 100
  !fRef.eof() count )
• fRef.seekg( count sizeof( Data ) )
• fRef.read( reinterpret_castlt char gt(
  temp ), sizeof( Data ) )
• if ( temp.partNumber gt 0
  temp.partNumber lt 100 )
• cout.setf( iosfixed iosshowpoint
  )
• cout ltlt setw( 7 ) ltlt temp.partNumber ltlt
  " "
• ltlt setiosflags( iosleft ) ltlt
  setw( 30 ) ltlt temp.toolName
• ltlt resetiosflags( iosleft ) ltlt
  setw( 13 ) ltlt temp.inStock
• ltlt setprecision( 2 ) ltlt setw( 10 )
  ltlt temp.unitPrice ltlt '\n'

• void updateRecord( fstream fRef )
• Data temp
• int part
• cout ltlt "Enter the part number for update "
• cin gtgt part
• fRef.seekg( part sizeof( Data ) )
• fRef.read( reinterpret_castlt char gt( temp
  ), sizeof( Data ) )
• if ( temp.partNumber ! -1 )
• cout ltlt setw( 7 ) ltlt "Record" ltlt " " ltlt
  setiosflags( iosleft )
• ltlt setw( 30 ) ltlt "Tool name" ltlt
  resetiosflags( iosleft )
• ltlt setw( 13 ) ltlt "Quantity" ltlt setw(
  10 ) ltlt "Cost\n"
• cout.setf( iosfixed iosshowpoint )
• cout ltlt setw( 7 ) ltlt temp.partNumber ltlt "
  "
• ltlt setiosflags( iosleft ) ltlt setw(
  30 ) ltlt temp.toolName
• ltlt resetiosflags( iosleft ) ltlt setw(
  13 ) ltlt temp.inStock

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Source Code Page 4

• fRef.seekp( ( temp.partNumber ) sizeof( Data )
  )
• fRef.write( reinterpret_castlt char gt (
  temp ), sizeof( Data ) )
• else
• cerr ltlt "Cannot update. The record is
  empty.\n"
• void insertRecord( fstream fRef )
• Data temp
• int part
• cout ltlt "Enter the partnumber for insertion
  "
• cin gtgt part
• fRef.seekg( ( part ) sizeof( Data ) )
• fRef.read( reinterpret_castlt char gt ( temp
  ), sizeof( Data ) )
• if ( temp.partNumber -1 )
• temp.partNumber part

• fRef.seekp( ( temp.partNumber ) sizeof( Data )
  )
• fRef.write( reinterpret_castlt char gt(
  temp ), sizeof( Data ) )
• else
• cerr ltlt "Cannot insert. The record contains
  information.\n"
• void deleteRecord( fstream fRef )
• Data blankItem -1, "", 0, 0.0 , temp
• int part
• cout ltlt "Enter the partnumber for deletion "
• cin gtgt part
• fRef.seekg( part sizeof( Data ) )
• fRef.read( reinterpret_castlt char gt( temp
  ), sizeof( Data ) )
• if ( temp.partNumber ! -1 )

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Output