(Revision of C++) XII COMPUTER
SCIENCE
MARKS-20x2=40 SET-CS02
Q1.What will be the sizes of following constants : ‘\a’ , “\a” , “Ra\\o\ne\’s\t” , “\”RAM\”” ?
Q2.What are the predefined stream objects in I/O library?
Q3.Point out the errors in the following program :
int
main ()
{
cout << “Enter variable “ ;
cin >> var ;
sqrs = var * var;
cout << “ The square is “
<<
sqrs;
Q4.Which of the following are valid character constants in
C++ ?
‘C’ , ABC’
, “ABC” , my , ‘main’s’ , ‘ ‘’ ‘ , ‘char, ‘\\’
Q5. Given the following code fragment
int ch = 64;
cout << ++ch << “\n” <<
ch<<”\n”;
- What will be the output?
- What is the effect of replacing ++ch with ch+1;
Q6.What will be the result of following expressions if i=10
initially ?
(i)
++i<=10
(ii) i++ <= 10 (iii) ++i = i++ (iv) +i++ = 5 (v) +++i<=10
Q7. Given the following two definitions:
Unsigned int u1=0, u2=7;
What is the result of each of the
following expressions?
(i)
u1&&u2 (ii) u1||u2 (iii) !u1 (iv) !!u1 (v) !(-5)
Q8. Given the
following set of identifier s?
char ch
;
short
sh ;
int
intval ;
long
longval ;
float
fl ;
Identify the data type of the following expressions
(a) ‘a’-3 (b)intval*longval-ch (c)fl+longval/sh
Q9. What output
will the following code fragment produce?
int val
, res, n= 1000;
cin
>> val;
res=n=val>1750?
400:200;
cout<<
res ;
(I)
If the input is 2000
(II)
If the input is 1000
(III)
If the input is 500
Q10.Using the declaration of Q.8 , identify which of the
following assignments are unsafe (where there may be loss of data)
(a) Sh=intval (b)intval=longval (c) sh=ch
Q11. What is the
output of the following code snippet?
main ()
{ int I = j =k =0 ; Cout<<I<<j<<k; }
Q12. Evaluate the
following expressions:
(I)
x-y < z && y+z > x || x-z
<=y-x+z if x= 4, y= 7 and
z=10?
(II)
(y)&& (y-z)|| ! (2y+z-x) if x=13, y=14, and z= 15
Q13.Evaluate the following c++ expressions where a,b,c are
integers and d,f are floating point numbers. The value of a=5 , b=3 and d =15
(a) f
= a+b/a
(b) c=d*a+b
(c) c=(a++)*d+a
(d) f=(++b)*b-a
(e) c=a-(b++)*(--a)
Q14. Predict the output of the following codes :
(i)
if(!3)
{
cout<<”Tricky1\n”;
}
cout<<”YES”;
(ii)
If(0)
cout<<”Tricky2\n”;
cout<<”Tricky3\n”;
(iii)
If(!0)
cout<<”Tricky4\n”;
cout << “No??”;
Q15. What will be the output when the input is (a) ‘A’ (b)
‘C’ (c) ‘D’ (d) ‘F’ (e) 65 (f) 66 ?
[PART-1]
cin >> ch;
Switch(ch)
{
case ‘A’
: cout << ” GRADE-A”;
case ‘B’ : cout
<< “GRADE-B”;
break;
case ‘C’ : cout
<<” GRADE-C”;
default : cout
<< “GRADE-D”;
[PART-2]
cin >> ch;
Switch(ch)
{
case ‘F’ :
cout << “GRADE-F”;
break;
default : cout
<< “GRADE-D”;
case ‘C’ : cout
<<” GRADE-C”;
case ‘A’ : cout << ” GRADE-A”;
break;
case ‘B’ :
cout << “GRADE-B”;
[PART-3]
char outer , inner ;
for (outer = ‘F’ ;
outer >= ‘A’ ; --outer)
{
for (inner
= ‘A’ ; inner <= outer ; inner++)
{ cout <<inner
; }
cout << endl;
}
Q16. What will be the output of the following program ?
#include<iostream.h>
Void
main()
{
long number =5678901, result = 0;
do
{
result *=10;
int digit = number %
10;
result +=digit;
number /=10;
} while (number);
Cout << “output = “<<result<<endl;
}
Q17. What will be the output of the following program?
#include<iostream.h>
int &max(int &x , int &y)
{
if (x>y)
return x;
else
return y;
}
Void main ()
{
int A=10,B=13;
max(A,B)=-1;
cout<<”A=”<<A<<”B=”<<B<<endl;
max(B,A)=7;
cout<<”A=”<<A++<<”B”<<B--<<endl;
max(A,B)=3;
cout<<”A=”<<A<<”B=”<<B<<endl;
}
Q18. What will be the output of the following program?
#include<iostream.h>
Void main()
{
int m=20;
{
int m=10* ::m;
cout
<<”m=”<<m<<” ::m=”<<::m<<endl;
}
Q19. What will be the output of the following program?
#include<iostream.h>
Void Execute(int
&x , int y = 200)
{ int temp=x+y;
x+=temp;
If(y !=200)
cout <<
temp<<x<<y<<endl;
}
Void main()
{ int a=50,b=20;
Execute(b);
Cout<<a<<b<<endl;
Execute(a,b);
Cout<<a<<b<<endl;
}
Q20. What will be the output of the following program?
int sum (int arr[],int size);
int main()
{
int val [] =
{1,3,5,7,9,11,13,15,17,19};
int s1=0, s2=0;
S1=sum(val,10);
S2=sum(val+4,6);
cout<<”s1=”<<s1<<”\n”;
cout<<”s2 =”<<s2<<”\n”;
return 0;
}
int sum(int arr[],int size)
{ for (int
i=0,s=0;i<size;++i)
S+=arr[i];
Return s;
}
