POINTERS
ASSIGNMENT
Assignment
Date: 09/09/15
Submission Date: 14/09/15
Submission Date: 14/09/15
Q1. What
will be the output of the following program:
int main()
{
int x [ ] = { 50, 40, 30, 20, 10}:
int *p, *t;
p = x;
t = x + 1;
cout << *p << “,” << *t++;
return 0;
}
Q2. What will be the output of the program( Assume all necessary
header files are included)
void print (char * p )
{
p = "Comp";
cout<<"value is "<<p<<endl;
}
int main( )
{
char * x = "Class XII";
print(x);
cout<<"new value is "<<x<<endl;
return 0;
}
Q3. Identify errors on the following code segment, and
underline the error.
float c[ ] ={ 1.2,2.2,3.2,56.2};
float *k,*g;
k=c;
g=k+4;
k=k*2;
g=g/2;
cout<<”*k=”<<*k<<”*g=”<<*g;
Q4. Write the output of the following program.
void print (char * p )
{
p = "Comp";
cout<<"value is "<<p<<endl;
}
int main( )
{
char * x = "Class XII";
print(x);
cout<<"new value is "<<x<<endl;
return 0;
}
Q5. Predict the output of the following code:
#
include<iostream.h>
int main()
{
int arr[] = {12, 23, 34, 45};
int *ptr = arr;
int val = *ptr; cout << val << endl;
val = *ptr++; cout << val << endl;
val = *ptr; cout << val << endl;
val = *++ptr; cout << val << endl;
return 0;
}
Q6. What will be the output of the following program?
#include<iostream.h>
#include<ctype.h>
#include<string.h>
void changestring(char text[], int &counter)
{
char
*ptr = text;
int
length=strlen(text);
for(;counter<length-2;counter+=2,
ptr++)
{
*(ptr+counter)
= tolower(*(ptr+counter));
}
}
int main()
{
int
position = 0;
char
message[]= “POINTERS FUN”;
changestring(message,
position);
cout<<message<<
“@” <<position;
return
0;
}
Q7. Why does
an array always start with index 0 in C++?
Q8. What is “this”
pointer? Give an example to illustrate the use of it in C++.
Q9. Write a
program to illustrate the use of structure pointers.
Q10. Distinguish
between
int *ptr = new int(5); //Statement 1
int *ptr = new int(5); //Statement 1
Int *ptr = new int[5]; //Statement
2
Q11.Write a
program in C++ to calculate the row sum and column sum of a 2-D array using
pointers (i.e. Dynamic Memory Allocation).
Q12. Write a
program to exchange the positions of strings stored in array using array of
pointers.
Q13. Identify
the errors, if any in the following program. Also give reasons for errors.
int main()
{
const int i=2;
const int* const ptr = &i;
*ptr++;
int j =15;
ptr = &j;
return 0;
}
-------------------------------------------------------------------------------
Data File Handling Assignment
Assignment Date: 07/09/15
Submission Date: 11/09/15
Submission Date: 11/09/15
Q1. Write a program to copy the content of a file
“INPUT.TXT” into another file “OUTPUT.TXT”.
Q2. Write a function in C++ to count the number of lowercase
alphabets present in a text file “BOOK.TXT”.
Q3. Write a function to modify a record in binary file
“COLONY.DAT” using structure concept.
Q4. Write a function in C++ to count the number of lines
present in a text file “STORY.TXT”.
Q5. Write a
function in C++ to search for a BookNo from a binary file “BOOK.DAT”, assuming
that the binary file is containing the objects of the following class:
class {
int BookNo;
char Title[20];
public:
class {
int BookNo;
char Title[20];
public:
int RBno( ){
return BookNo; }
void Enter( ){
cin>>BookNo; gets(Title); }
void
Display( ){ cout<<
BookNo<<Title<<endl;}
};
Q6. Write a function in C++ to add new objects at the bottom
of a binary file “STUDENT.DAT”, assuming the binary file is containing the
objects of the following class.
class STUD{
int Rno;
char Name[20];
public:
void Enter(){ cin>>Rno; gets(Name);}
void Display(){cout<<Rno<<Name<<endl;}
};
Q7. Observe
the program segment carefully and answer the question that follows:
class
item
{
int
item_no;
char
item_name[20];
public:
void
enterDetail( );
void showDetail(
);
int
getItem_no( ){ return item_no;}
};
void
modify(item x, int y )
{
fstream
File;
File.open(
“item.dat”, ios::binary | ios::in | ios::out) ;
item
i;
int
recordsRead = 0, found = 0;
while(!found
&& File.read((char*) &i , sizeof (i)))
{
recordsRead++;
if(i .
getItem_no( ) = = y )
{
_________________________//Missing
statement
File.write((char*)
&x , sizeof (x));
found
= 1;
}
}
if(!
found)
cout<<”Record
for modification does not exist” ;
File.close()
;
}
If the
function modify( ) is supposed to modify a record in the file “ item.dat
“,which item_no is y, with the values of item x passed as argument, write
theappropriate statement for the missing statement using seekp( ) or seekg(
),whichever is needed, in the above code that would write the modified record
at its proper place.
Q8. Observe the program segment given
below carefully and fill the blanks marked as Statement 1 and Statement 2 using
seekp() and seekg() functions for performing the required task.
#include
<fstream.h>
class
Item
{
int
Ino;char Item[20];
public:
//Function
to search and display the content from a particular record number
void
Search(int );
//Function
to modify the content of a particular record number
void
Modify(int);
};
void
Item::Search(int RecNo)
{
fstream
File;
File.open("STOCK.DAT",ios::binary|
ios::in);
______________________
//Statement 1
File.read((char*)this,sizeof(Item));
cout<<Ino<<"==>"<<Item<<endl;
File.close();
}
void
Item::Modify(int RecNo)
{
fstream
File;
File.open("STOCK.DAT",ios::binary|ios::in|ios::out);
cout>>Ino;
cin.getline(Item,20);
______________________
//Statement 2
File.write((char*)this,sizeof(Item));
File.close();
}