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CBSE Computer Science - Revision Tour(Solved)

CBSE Guess > eBooks > Class XII > CBSE Computer Science Data File Handling Solved Revision Tour By Mr. Ravi Kiran

COMPUTER SCIENCE DATA FILE HANDLING

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4.a) Observe the program segment given below carefully, and answer the question that follows:

class candidate
{ long Cid ; // Candidate’s Id
char CName[20] ; // Candidate’s Name
float Marks ; // Candidate’s Marks
public ;
void Enter( ) ;
void Display( ) ;
void MarksChange( ) ;
//Function to change marks
long R_Cid( ) {return Cid ;}
} ;
void MarksUpdate (long Id)
{ fstream File ;
File.open (“CANDIDATE.DAT”, ios :: binary|ios::in|ios :: out) ;
Candidate C ;
int Record = 0, Found = 0 ;
while (!Found&&File.read((char*)&C, sizeof(C)))
{ if (Id = =C.R_Cid( ))
{ cout << “Enter new Marks” ;
C.MarksChange( ) ;
File.seekp(File.tellp( )-sizeof(C));
//Statement 1
//File.seekp(Record*sizeof(C));
File.write((char*)&C,sizeof(C));
//Statement 2
//File.write((char*)&C,sizeof(Candidate));
Found = 1 ;
}
Record++ ;
}
if (Found = = 1)
cout << “ Record Updated” ;
File.close( ) ;
}

Write the Statement to position the File Pointer at the beginning of the Record for which the Candidate’s Id matches with the argument passed, and Statement 2 to write the updated Record at that position.

4.b) Write a function in C++ to count the number of uppercase alphabets present in a text file “ARTICLE.TXT”.

Solution:

void UpperLetters( )
{ clrscr( );
ifstream fin("ARTICLE.TXT",ios::in);
char ch;
int uppercount=0;
while(fin)
{ fin.get(ch);
if(isupper(ch))
uppercount++; }
cout<<"\nTotal number of Uppercase alphabets in the file = "<<uppercount;
getch( );
}

 

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CBSE Computer Science Solved Revision Tour By Mr. Ravi Kiran ( [email protected] )