CBSE Class 12 Computer Science HoTs Programming in C++ 3 Marks Question

<p>

</p>1 Give output of following code fragment:
int val, res, n = 1000;
cin >> val;
res = n + val > 1750 ? 400 : 200;
cout << res;
(a) if the input is 2000.
(b) if the input is 1000.
(c) if the input is 500.

2 What will be the output if input is:
(i) a (ii) c (iii) d (iv) h (v) b
char ch, out [10] = “ ”;
cin >> ch;
switch (ch) {
case ‘a’: strcat(out, “a”);
case ‘b’: strcat(out, “b”);
case ‘c’: strcat(out, “c”);
break;
case ‘d’: strcat(out, “d”);
break;
default : strcat(out, “Not abcd”);
}
cout << out << endl;

3 Give output of following code fragment:
char *msg = “a ProFile”;
for (int i = 0; i < strlen (msg); i++)
if (islower(msg[i]))
msg[i] = toupper (msg[i]);
else
if (isupper(msg[i]))
if( i % 2 != 0)
msg[i] = tolower (msg[i-1]);
else
msg[i--];
cout << msg << endl;

4 Give output of following code fragment:
5char *msg = “WELCOME”;
for (int i = strlen (msg) - 1; I >= 0; i--)
if (islower(msg[i]))
msg[i] = toupper (msg[i]);
else
if (isupper(msg[i]))
if( i % 2 != 0)
msg[i] = tolower (msg[i-1]);
else
msg[i--];
cout << msg << endl;

5 Find output
#include<iostream.h>
struct Box {
int Len, Bre, Hei;
};
void Dimension(Box B)
{
cout << B.Len << “ X ” << B.Bre << “ X ”;
cout << B.Hei << endl;
}
void main ( )
{
Box B1 = {10, 20, 8}, B2, B3;
++B1.Hei;
Dimension (B1);
B3= B1;
++B3.Len;
B3.Bre++;
Dimension (B3);
B2= B3;
B2.Hei += 5;
B2.Len - = 2;
Dimension (B2);
}

6 Give output
int Execute( int M)
{
if (M % 3 = 0)
return M * 3;
else
return M + 10;
}
void output( int B = 2)
{
for (int T = 0; T < B; T++)
cout << Execute(T) << “*”;
cout << endl;
}
void main()
{
output (4);
output ( );
output (3);
}

7 Give the output of the following program:
void main()
{
int ar[] = {2, 3, 4, 5};
int *ptr = arr;
int val = *ptr; cout << val << endl;
val = *ptr ++; cout << val << endl;
val = *ptr; cout << val << endl;
val = * ++ptr; cout << val << endl;
}

8 Give the output of the following program:
void main()
{
int ar[] = {2, 3, 4, 5};
int *ptr = arr;
int val = *ptr; cout << val << endl;
val = *ptr ++; cout << val << endl;
val = *ptr; cout << val << endl;
val = * ++ptr; cout << val << endl;
}

9 Give the output of the following program :
#include<iostream.h>
struct point
{
int x,y;
};
void showpoint p)
{
cout<<p.x<< ‘:’<<p.y<<endl;
}
void main()
{
point u = {20,10},V,W;
v=u;
v.x+=20;
w=v;
u.y+=10;
u.x+=5;
w.x-=5;
show(u);
show(v);
show(w);
}

10. Write the output of the following program :
#include<iostream.h>
int calc(int u)
{
if(u%2==0)
return u+10;
else
return u*2;
}
void pattern(char M, int B=2)
{
for(int cnt=0;cnt<b;cnt++)
cout<<calc(cnt)<<m;
cout<<endl;
}
void main()
{
pattern(‘*’);
pattern(‘#’,4);
pattern(‘@’,3);
}

11 Find the output of the following program:
#include<iostream.h>
#include<conio.h>
void ChangeContent(int Arr[], int Count)
}
void main()
{
clrscr( );
int A[ ]={3, 4 , 5}, B[ ]={10,20,30,40}, C[ ]={900, 1200}, L ;
ChangeContent(A,3);
ChangeContent(B,4);
ChangeContent(C,2);
for(L=0 ; L<3 ; L++)
{
cout<<A[L]<<"#";
}
cout<<endl;
for(L=0 ; L<4 ; L++)
{
cout<<B[L]<<"#" ;
}
cout<<endl;
for(L=0 ; L<2 ; L++)
{
cout<<C[L]<<"#" ;
}
getch();
}

12 Find the output of the following program:
#include<iostream.h>
#include<conio.h>
struct Game
{
char Magic[20];
int Score;
};
void main()
{
clrscr();
Game M={"Tiger", 500} ;
char *Choice ;
Choice = M.Magic;
Choice[4]='P' ;
Choice[2]='L' ;
M.Score+=50;
cout<<M.Magic<<M.Score<<endl;
Game N= M;
N.Score-=120 ;
cout<<N.Magic<<N.Score<<endl;
getch();
}

13 Write the output of the following program:
#include<iostream.h>
{
for(int C=1 ; C<Count ; C++)
{
Arr[C-1]+=Arr[C] ;
}
#include<string.h>
#include<ctype.h>
void convert (char str[], int len)
{
for (int count =0; count <len; count++)
{
if ( isupper(str[count]))
str[count]=tolower(str[count]);
else if ( islower(str[count]))
str[count]=toupper(str[count]);
else if ( isdigit(str[count]))
str[count]=str[count]+2;
else
str[count]= ‘#’;
}
}
void main()
{
char text[]= “AISSCE 2008@”;
int size =strlen(text);
convert (text,size);
cout<<text<<endl;
for (int c =0, r=size-1; c<=size/2;c++, r--)
{
char temp= text[c];
text [c]= text[r];
text[r]= temp;
}
cout<< text << endl;
}

14 Give the output of the following program.
#include < iostream.h >
#include <conio.h >
int a = 10;
int main( )
{
void demo ( int &, int , int *);
clrscr( );
int a = 20;
demo ( ::a,a,&b);
cout << ::a << “\t” << a << “\t” << b;
}
void demo ( int &x, int y , int *z )
{
a += x; y *= a; *z = a+y;
cout << x << “\t” << y << “\t” << *z << endl;
}

15 Write the output of the follwoing program segment
char *NAME="ComPUteR";
for(int x=0;x<strlen(NAME);x++)
if(islower(NAME[x]))
NAME[x]=toupper(NAME[x]);
else
if(isupper(NAME[x]))
if(x%2==0)
NAME[x]=tolower(NAME[x]));
else
NAME[X]=NAME[x-1];
puts(NAME);

16 What will be the output of the following program
#include<iostream.h>
#include<ctype.h>
#include<conio.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) = toupper(*(ptr+counter));
}
}
void main()
{
clrscr();
int position = 0;
char message[]= “Mouse Fun”;
changestring(Message,position);
cout<<message<< “@” <<position;
}

17 What will be the output of the following program:
#include<iostream.h>
#include<ctype.h>
#include<conio.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) = toupper(*(ptr+counter));
}
}
void main()
{
clrscr();
int position = 0;
char message[]= “Pointer Fun”;
changestring(Message, position);
cout<<message<< “@” <<position;
}

18. Find the output of the following program
# include<iostream.h>
#include<string.h>
class state
{ char * state_name;
int size;
public;
state( ); { size=0; state_name=new char[size+1]; }
state(char *s)
{ size = strlen(s) ; state_name = new char[size+1];}
strcpy(state_name, s);
}
void display() {cout<<state name<<endl; }
void Replace (state &a, state &b)
{ size = a.size + b.size;
delete state_name;
state_name = new char[size+1] ;
strcpy(state_name, a.state_name);
strcat(state_name, b.state_name);
}
};
void main( )
{ char *temp = “Delhi”;
state state1(temp), state2(”Mumbai”), state3(”Nagpur”), S1, S2;
S1.Replace(state1, state2);
S2.Replace(S1, state3);
S1.display( );
S2.display( );
}

19 Rewrite the following program after removing the syntactical error(s), if any. Underline each
correction.
#include <iostream.h>
void main( )
{ struct movie
{ char movie_name [20];
char movie type;
int ticket cost = 100;
}MOVIE;
gets(movie_name);
gets(movie_type);
}

20 Find the output of the following program:
#include<iostream.h>
#include<string.h>
class student
{ char *name;
int I ;
public:
student( ) {I =0; name=new char [ I +1]; }
student (char *s)
{ I =strlen(s); name=new char[I+1];
strcpy (name,s);
}
void display( ) {cout<<name<<endl;}
void manipulate(student & a, student & b)
{ I = a.I + b.I;
delete name;
name=new char[I+1];
strcpy(name, a.name);
strcat(name, b.name);
}
};
void main( )
{ char * temp = “Jack”;
student name1 (temp), name2(” Jill”), name3(”John”),S1,S2;
S1 .manipulate (name1, name2);
S2.manipulate (S1, name3);
S1.display ( );
S2.display ( );
}

21 Find the output of the following program:
#include<iostream.h>
#include<string.h>
class country
{ char *country name;
int length;
public:.
country ( ) {length =0; country_name=new char [length+1];}
country (char *s)
{ length = strlen(s); country_name=new char [length +1];
strcpy (country_name, s);
}
void display ( ) { cout<< country_name <<endl;}
void Replace (country & a, country & b)
{ length a.length + b.length;
delete country_name;
country_name=new char [length + 1];
strcpy (country_ name, a.country_name);
strcat (country_name, b.country name);
}
};
void main ( )
{ char * temp = “India”;
country country1 (temp), country2 (“Nepal”), country3 (“China”), S1,S2;
S1.Replace (country1, country2);
S2.Replace (S1,country3);
S1.display( );
S2.display ( );
}

22 Find the output of the following program:
#include < iostream.h>
void main( )
{ int *PointerArray [10];
int marks [ = {75, 68, 90, 34, 0, 10, 90, 65};
for (int I = 0; marks [ I]!=0; I++)
{ PointerArray [I]=&marks[I];
* (PointerArray [I] ) += 5;
}
int index = 0;
while(index < I )
{ int p=*(PointerArray[index] );
if(p >=60) cout <<p<< ‘, ’;
index ++;
}
}

23 class book
{
int book_no;
char book_name[20];
float price;
public:
void enter_book_Details( )
{
cin>> book_no>> price; gets(book_name);
}
void show_book_Details( );
};
Assuming a binary file “BOOK.DAT” contains objects belonging to class book, write a user defined function to add more records to the end of it.

24 Assuming a binary file “BOOK.DAT” contains objects belonging to class book, write a user defined function to add more records to the beginning of it.

25 Assuming a binary file “BOOK.DAT” contains ten objects belonging to class book, write a user defined function to add a record as fifth record to this file. After the execution of your code, the
file “BOOK.DAT” should contain eleven records

26 A librarian maintains the record of books in a file named as “STOCK_BOOK.DAT”. Write a function in C++ to delete a record for book_no 10.

27 Observe the program segment carefully and answer the question that follows:
class student
{
int student_no;
char student_name[20];
int mark;
public:
void enterDetails( )
{
cin>> student_no >> mark ; gets(student_name);
}
void showDetail( );
int get_mark( ){ return mark;}
};
Assuming a binary file “RESULT.DAT” contains records belonging to student class, write a
user defined function to separate the records having mark
(i) Greater than 79 into “EXCELLENT.DAT” file
(ii) Greater than 59 but less than 80 into “AVERAGE.DAT” file.
(iii) Remaining records should be in “RESULT.DAT” file.

28 Given the binary file TELEPHONE.DAT , containing the records of the following class
Directory:
class Directory
{
char name[20];
char address[30];
char areaCode[5];
char phone_no[15];
public:
void register( );
void show( );
int checkCode( char AC[] )
{
return strcmp(areaCode, AC);
}
};
Write a function COPYABC( ) in C++ , that would copy only those records having areaCode as “123” from TELEPHONE.DAT to TELEBACK.DAT.

29 Write a function in C++ to add a new record into a binary file “customer.dat” , if the file
contains the objects of the following class:
class customer
{
int cust_no;
char name[20];
public:
void getData( )
{
cin>> cust_no;
cin.getline(name, 20 );
}
void showData( ); // Function to display customer details
};
30 Given the binary file ITEM.DAT, containing the records of the following structure:
struct item
{
int item_no;
char item_name[20];
int stock;
};
Implement the function AddStock( item x, int n), which updates a record by adding n to the existing stock for the item x in the file.

31 Write definition for a function SUMSEQUENCE() in C++ with two arguments/parameters –
double x and int n. The function should return a value of type double and it should perform sum
of the following series :
1-x/1! + x2/3! - x3/5! + x4/7! - x5/9 + …………………. Up to n terms.
(Note : The symbol ! represents Factorial of a number i.e. 5! = 5*4*3*2*1)

32 Write a C++ function SUMFUN() having parameters X (of type double) and n (of type integer)
with a result type as double to find the sum of the series given below :
X + X2/3! + X3/5! + ………….+ Xn/(2N-1)!

33 An array of a structure Student, S is required to be arranged in descending order of marks.
Write a C++ function to arrange the same with the help of bubble sort. The array and its size is required to be passed as parameters to the function.
Definition of structure student is as follows
struct Student
{
int rollno;
char name[20];
float marks;
};

34 An array E containing elements of structure Employee is required to be arranged in descending order of salary. Write a C++ function to arrange the same with the help of Selection sort. The
array and its size is required to be passed as parameters to the functions. Definitions of the structure is as follows
struct Employee
{
int empno;
char Ename[20];
float salary;
};

35 Give the output of the following program :
#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
void main( )
{
int b;
char bboy[10];
clrscr( );
bboy[0]=’d’,bboy[1]=’e’,bboy[2]=’f’,bboy[3]=’g’;
len(bboy);
getch( );
return 0;
}
void len(char boy[10])
{
int l,v=0;
l=strlen(boy);
for (int i=0;i<=l;i++)
{
if ((boy[i]==’a’)||(boy[i]==’e’)||(boy[i]==’i’)||(boy[i]==’o’ || (boy[i]==’u’))
v=v+1;
}
cout<<l<<v;
return;
}

36. Give the output of the following program :
#include<iostream.h>
#include<conio.h>
main( )
{
int number[10],a,b,c,d;
clrscr( );
for(int i=0;i<10;i++)
{
number[i]=i+i;
}
clrscr( );
for(int j=0;j<9;j++)

{
for(int k=j+1;k<10;k++)
{
if (number[j]>number[k])
{
a=number[j];
number[j]=number[k];
number[k]=a;
}
}
}
cout<<endl;
for(i=0;i<10;i++)
cout<<number[i]<<“\t”;i++;
getch( );
return 0;
}

37 Give the output of the following program :
#include<iostream.h>
#include<conio.h>
main( )
{
int a=0;
clrscr( );
char *name;
name= “Internet Browsing”;
for(a=0;a<=8;a++)
cout<<name[a+1];
cout<<endl;
cout<<name[a];
cout<<endl<<(int)name[a]-1;
getch( );
return 0;
}

38 Give the output of the following program :
#include<iostream.h>
#include<conio.h>
main( )
{
void arm(int);
clrscr( );
int num;
num=191;
arm(num);
getch( );
return 0;
}
void arm(int n)
{
int number, sum=0,dg,dgg,digit;
number=n;
while(n>0)
{
dg=n/10;
dgg=dg*10;
digit=n-dgg;
cout<<digit+digit<<endl;
sum=sum+digit*digit*digit;
n=n/10;
}
cout<<digit<<endl<<sum;
}

39 Give the output of the following program :
#include<iostream.h>
#include<conio.h>
#include<string.h>
main( )
{
clrscr( );
char *name;
int l;
name= “SHANA”;
l=strlen(name);
cout<<l<<endl<<(int) name[l-2];
cout<<endl;
cout<<name[l-3];
getch( );
return 0;
}

40 Give the output of the following program :
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
main( )
gets(name);
}
void setSalary(float f )
{
salary = f;
}
float get_salary( )
{
return salary;
}
};

41 Assuming the class Employee given below and a binary file EMPLOYEE.DAT contains objects of this class, write functions in C++ to perform the followings:
(i) Write an object at the end of the binary file.
(ii) Update the salary of all the employees whose salary is 10000 with a new salary
20000.
class Employee{
int emp_no;
char name[20];
float salary;
public:
void getData( )
{
cin>> emp_no>>salary;
gets(name);
}
void setSalary(float f )
{
salary = f;
}
float get_salary( )
{
return salary;
}
};

42 What is the output of the following program( Assume all necessary header files are
included) :
void main( )
{
char *name= “IntraNet”;
for ( int i = 0; i < strlen( name) ; i++)
{
if ( islower( name[i]) )
name[i] =toupper(name[i]) ;
else
name[i] = name[i - 1] ;
}
}

43 What is the output of the following program( Assume all necessary header files are
included) :
void main( )
{
char * name= “teAmIndia”;
for ( int i = 0; name[i] ! = ‘\0’ ; i + 2)
{
if ( islower( name[i]) )
name[i] = toupper(name[i]) ;
else
name[i] = tolower(name[i]);
}
}

44 What is the output of the following program( Assume all necessary header files are included) :
void main( )
{
{
char * name= “ThE bESt mAN wINs”;
for ( int i = 0; name[i] ! = ‘\0’ ; i + 1)
{
if ( islower( name[i]) )
name[i] = toupper(name[i]) ;
else
if( isupper(name[i]) )
if ( i % 2 = = 0) name[i] -- ;
else
name[i] = tolower(name[i - 1]
}
}

45 What is the output of the following program( Assume all necessary header files are
included) :
void main( )
{
char * str = “TEACHER”;
for ( int i = strlen(str) – 1 ; i >= 0 ; i --)
{
for ( int x = 0 ; x <= i ; x ++)
cout<<s[x] ;
cout<<”\n”;
}
}

46 What is the output of the following program( Assume all necessary header files are
included) :
void main( )
{
int * p[10];
int score[] = {80, 30, 74, 50, 34, 67,0, 98};
for ( int i = 0 ; score[i] != 0 ; i ++)
{
p[i] = & score[i];
*(p[i]) += 10;
}
int count = 0;
while( count < i)
{
int q = *(p[count]);
count++ ;
if(q > 50)
cout<<q<<“,”;
}
}

47 What will be the output of the following program :
# include<iostream.h>
#include<ctype.h>
#include<conio.h>
#include<string.h>
void NewText(char str[ ], int & pos)
{
char * p = str;
int length = strlen(p);
for( ; pos < length - 2; pos += 2 , p++)
{
*(p + pos) = toupper(*(p+pos));
}
cout<<str;
}
void main( )
{
clrscr( );
NewText(“Good Morning”, 0) ;
}

48 What is the output of the following program( Assume all necessary header files are
included) :
# include <iostream.h>
# include<ctype.h>
#include<string.h>
#include<conio.h>
class country{
char * c_name;
int length;
public:
country( )
{
length = 0;
c_name = new char[length+1];
}
country(char * s)
{
length = strlen(s);
c_name = new char[length+1];
strcpy(c_name, s);
}
void display()
{
cout<<c_name<<endl;
}
void replace(country &a, country &b)
{
length= a.length+b.length;
c_name = new char[length+1];
strcpy(c_name, a.c_name);
strcpy(c_name, b.c_name);
}
};
void main( )
{
char *temp="India";
clrscr( );
country c1=temp, c2("Nepal"),c3;
c3.replace(c1,c2);
c3.display( );
getch( );
}

49 Find the output of the following program
# include<iostream.h>
void main ( )
{
char *name;
node *next;
}
node n[ ]={
{“Anamika”, n+1},
{“Shruthi”,n+2},
{“Swathi”,n}
};
node * m[3];
for(int i=0;i<3;i++)
m[i]=n[i].next;
cout.write(m[0]->name,7); cout.put(‘\n’);
cout.write((*m)->name,7); cout.put(‘\n’);

50. Write a function in C++ to count the number of vowels present in a text file STORY.TXT”.

BOOLEAN ALGEBRA

1 Solve the following F(a,b,c,d)=∑(0,1,3,4,5,7,8,9,11,12,13,15). Obtain the simplified form using K-Map.

2 Minimize F (a, b, c, d ) = ∑1, 2, 3, , 11, 12, 14, 15) using K-map.

3 Given the logic function F = xyz + yz’w + x’yz. Minimize it using K- Map.

4 Obtain a simplified form for the following Boolean Expression using K Map and after simplifying draw its circuit diagram.
F=m₀+m₁+m₂+m₄+m₅+m₇+m₈+m₉+m₁₀+m₁₁

5 Obtain a simplified form for the following Boolean expression using K-Map and draw its circuit
diagram.
F=M₀.M₁.M₃.M₅.M₈.M₁₀.M₁₃

6 Obtain the simplified form of a Boolean Expression using Karnaugh Map
F(w,x,y,z)=S(0,1,2,3,4,8,9,10,11)

7 Reduce the following Boolean Expression with the help of Karnnaugh Map
F(U,V,W,Z)=S(0,1,2,3,12,13,14,15)

8 Use K Map to simplify the Boolean function
F(a,b,c,d)= ∑(1,3,4,5,6,7,9,11,12,13,14,15)

9 A combinational circuit has 4 inputs and one output. Output is 1 when
• all the inputs are equal to 1
• none of the inputs are equal to 1
• an odd number of inputs are equal to 1
(a) Obtain the truth table
(b) Find the simplified output function in SOP Form
(c) Find the simplified output function in POS Form
(d) Draw the logic diagram

10 There are 4 parallel railway tracks at a place. It is desired to design a logic circuit, which can give a signal when three or more trains pass together at any given time
i) Draw the truth table for the above problem
ii) Simplify the expression using K – Map
iii) Draw the circuit diagram

11 Output of 4 input (x,y,z,w) Boolean function F is 1 when
i) At least two variable have the truth value 1
ii) At least three variable have the truth value 1
iii) Only when the three variable have the truth value 1
Draw the truth table. Solve it by using K map in Product of Sum terms

12 Minimize the Boolean Expression using XYZ+XYZ’+XY’Z’ +X’Y’Z’+ X’YZ using Karnaugh Map

13 Simplify for the function F=π(0,3,7,8,9,12,13)

14 Draw the truth table for a full adder and then simplify the Sum and Carry by using K-map.
After that draw its circuit diagram.

15 Give the logic function F=AB+A’B’+A’B. Assuming the complements are available. Simplify
the function using De Morgan’s Theorem. Synthesize F by using NOR gates only.