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

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( );
}

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