Computer Science, Class XII ( ) (Summer Vacation-2015) (Holiday H.W) Chapter No.1 to 3

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1 (Summer Vacation-2015) (Holiday H.W) Chapter No.1 to 3 1. Why main function is so special in C++? Give at least two reasons. /* CBSE 1999 */ 2. Differentiate between call by value & call by reference with a suitable example in C++. /*CBSE 2005, 2009, 2010, 2014 */ 3. What do you mean by actual parameter and formal parameter? Explain with an example. /*CBSE 2009 */ 4. Differentiate between global & local variable with a suitable example in C++. /* CBSE 2003 */ 5. Illustrate the use of #define in C++ to define a macro. /* CBSE 2006 */ 6. What do you understand by syntax error, logical error & run time error? Explain with example. /*CBSE 2007 */ 7. Find the correct identifiers out of the following, which can be used for naming variable, constants and functions in a C++ programs: /*CBSE 2015 */ For, while, INT, NeW, delete, 1stName, Add+Subtract, name1 8. Give the difference between the type casting and automatic type conversion. Also, give a suitable C++ code to illustrate both. /*CBSE 2011, 2012 */ 9. What do you mean by token? Difference between identifier and keyword with an example. 10. How is entry controlled loop different from exit controlled loop? Explain with one example of each. 11. What is the purpose of using a typedef command in C++? Explain with suitable example. /* CBSE 2008 */ 12. What is the difference between a typedef name and a reference name in C++? Explain with suitable example. 13. What is the difference between a typedef name and a reference name in C++? Explain with suitable example. 14. What are Nested Structures? Give an example. /* CBSE 2006 */ 15. What is the difference between #define & const? Explain through example. /* CBSE 2008 */ 16. Differentiate between break and continue statements. 17. Difference between function definition and function prototype with an example. 18. How does a class enforce data hiding, abstraction and encapsulation? 19. While implementing encapsulation, abstraction is also implemented. Comment. 20. Reusability of classes is one of the major properties of OOP. How is it implemented in C++? /* CBSE 2001 */ 21. Define inheritance with example. Give two advantages of inheritance. 22. Illustrate the concept of function overloading with the help of an example. /*CBSE 2003, 2000, 2014*/ 23. What do you understand Polymorphism? Give an example illustrating its use in a C++ program. /* CBSE 2004 */ 24. What is the benefit of using default argument in a function? Give a suitable example to illustrate it using C++ code. /* CBSE 2013 */ 25. Name the Header file(s) that shall be needed for successful compilation of the following C++ code. (a) /*CBSE 2008 */ { char String[ ] = Peace ; cout << setw(2)<<string; (b) /*CBSE 2007 */ { char String[20]; gets(string); strcat(string, CBSE ); puts(string); Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

2 (c). typedef char STRING[80]; /*CBSE 2015 */ { STRING Txt[ ]= We love Peace ; int count=0; while (Txt[count]!= \0 ) if (isalpha(txt[count])) ; Txt[count++]= # ; puts[txt]; 26. Rewrite the following program after removing the syntactical error(s) if any. Underline each correction. (a) include<iostream.h> /* CBSE 1998 */ { int R; W=90; while W>60 { R=W-50; switch(w) { 20:cout<< Lower Range <<endl; 30:cout<<.Middle Range.<<endl; 40:cout<<.Higher Range.<<endl; (b) struct Pixels { int Color, Style; void ShowPoint(Pixels P) { cout<<p.color, P.Style<<endl; { Pixels Point1=(5,3); ShowPoint(Point1); Pixels Point2=Point1; Color.Point1+=2; ShowPoint(Point2); (c) /* CBSE 2011 */ typedef char[80] String; { String S= Peace ; int L=strlen(S); cout<<s<< has <<L<< characters <<endl; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

3 (d) /* CBSE 2014 */ typedef char[80] STR; { Txt STR; gets(txt); cout<<txt[0]<< \t<<txt[2]; cout<<txt<<endline; (e) #Define float MaxSpeed=60.5; /* CBSE 2015 */ { int MySpeed char Alert= N ; cin>> MySpeed; if MySpeed> MaxSpeed Alert= Y ; cout<<alert<<endline; 27. Find the output of the following program: void change(int &N1,int &N2) { N1+=N2; N2+=N1; void main() { int Num1=25, Num2=20; cout<<"num 1="<<Num1--<< "Num 2 = "<<Num2 + 6<<endl; change(num1,num2); cout<<"num 2="<<++Num2<< "Num 1 = "<<Num1-5<<endl; change(num2,num1); cout<<"num 1="<<--Num2<< "Num 2 = "<<Num2--<<endl; 28. Find the output of the following program: /* CBSE 2000 */ int func(int &x,int y=10) { if(x%y==0) return ++x; return y--; { int p=20,q=23; q=func(p,q); cout<<p<<q<<endl; p=func(q); cout<<p<<q<<endl; q=func(p); cout<<p<<q<<endl; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

4 29. Find the output of the following program: int Calc(int U) { if (U%2==0) return U+10; return U+2; void pattern (char M,int B=2) { for(int CNT =0;CNT <B;CNT ++) cout << Calc (CNT)<<M; cout << endl; { pattern('*'); pattern('#',4); pattern('@',3); 30. Find the output of the following program: int a=3; void demo(int x, int y, int &z) { a+=x+y; z=a+y; y+=x; cout<<x<< <<y<< <<z<<endl; { int a=2,b=5; demo(::a,a,b); cout<<::a<< <<a<< <<b<<endl; demo(::a,a,b); 31. Find the output of the following program: /* CBSE 2015 */ void Location(int &X, int Y=4) { Y+=2; X+=Y; { int PX=10, PY=2; Location(PY); cout<<px<<, <<PY <<endl; Location(PX, PY); cout<<px<<, <<PY <<endl; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

5 32. Find the output of the following program: /* CBSE 2000 */ #include<ctype.h> { char *NAME= aprofile ; for(int x=0;x<strlen(name);x++) if(islower(name[x])) NAME[x]=toupper(NAME[x]); if(isupper(name[x])) if(x%2!=0) NAME[x]=tolower(NAME[x-1]); NAME[x]--; cout<<name<<endl; 33. Find the output of the following program: /* CBSE 2009 */ #include<ctype.h> void Encode(char Info[ ],int N); { char memo[ ]= Justnow ; Encode(memo, 2); cout<<memo<<endl; void Encode(char Info[ ],int N) { for(int I=0;Info[I]!= \0 ;I++) { if(i % 2 = = 0) Info[I]= Info[I] N; if (islower(info[i])) Info[I] = toupper (Info[I]); Info[I] = Info[I] + N; 34. Find the output of the following program: /* CBSE 2009 */ { int A[ ]={12,18,20, 35,40; int *p=a; while(*p<30) { if(*p%3!=0) *p=*p+5; *p=*p+2; p++; for(int j=0;j<=4;j++) { cout<<a[j]<<"*"; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

6 if(j%3==0) cout<<endl; cout<<a[4]*3<<endl; 35. Find the output of the following program: struct PLAY { int Score, Bonus; ; void Calculate(PLAY &P, int N=10) { P.Score++; P.Bonus+=N; void main() { PLAY PL={10,15; Calculate(PL,5); cout<<pl.score<< : <<PL.Bonus<<endl; Calculate(PL); cout<<pl.score<< : <<PL.Bonus<<endl; Calculate(PL,15); cout<<pl.score<< : <<PL.Bonus<<endl; 36. Find the output of the following program: /* CBSE 2010 */ struct THREE_D { int x,y,z; ; void movein(three_d &T, int step=1) { T.x+=step; T.y-=step; T.z+=step; void moveout(three_d &T, int step=1) { T.x-=step; T.y+=step; T.z-=step; { THREE_D T1={10,20,5,T2={30,10,40; movein(t1); moveout(t2,5); cout<<t1.x<<","<<t1.y<<","<<t1.z<<endl; cout<<t2.x<<","<<t2.y<<","<<t2.z<<endl; movein(t2,10); cout<<t2.x<<","<<t2.y<<","<<t2.z<<endl; Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

7 37. Find the output of the following program: /* CBSE 2013 */ class Mausam { int City, Temp, Humidity; public: Mausam(int C=1) { City=C; Temp=10; Humidity=63; void Sun(int T) { Temp+=T; void Rain(int H) { Humidity +=H; void Checkout( ) { cout<<city<< : <<Temp<< & <<Humidity<< % <<endl; ; { Mausam M, N(2); M.Sun(5); M.Checkout( ); N.Rain(10); N.Sun(2); N.Checkout( ); M.Rain(15); M.Checkout( ); 38. In the following program, find the correct possible output(s) from the options if the value of VAL is 10 as input: #include<stdlib.h> void main() { randomize( ); int VAL, Rnd; int n=1; cin>>val; Rnd=8 + random(val) * 1; while(n<=rnd) { cout<<n<< \t ; n++; Output options: i) ii) iii) iv) Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

8 39. Observe the following program, and find out, which output out of (i) to (iv) will not be expected from the program? What will be the minimum and maximum value assigned to the variable Chance? /* CBSE 2012 */ #include <stdlib.h> void main() { randomize(); int Arr[ ]={9,6, N; int Chance=random(2)+10; for (int c=0; c<2; c++) { N=random(2); cout<<arr[n]+chance<< # ; a. 9#6# b. 19#17# c. 19#16# d. 20#16# 40. Study the following C++ code and find out the possible output or outputs out of the options (i) to (iv)? Also, write the minimum and maximum value, which can be assigned to the variable VAL. /* CBSE 2015 */ #include <stdlib.h> { randomize(); int VAL; VAL= random(3)+2; char Guess[ ]= ABCDEFGHIJK ; for (int I=1; I<=VAL; I++) { for (int J=VAL; J<=7; J++) cout<< Guess[J]; cout<<endl; (i) BCDEFGH (ii) CDEFGH (iii) EFGH (iv) FGHI BCDEFGH CDEFGH EFGH FGHI EFGH FGHI EFGH FGHI Mohd. Hashim, PGT (Computer Sc.), hashim_mbd@yahoo.co.in,

QUESTION BANK SUB: COMPUTER SCIENCE(083)

BHARATIYA VIDYA BHAVAN S V M PUBLIC SCHOOL, VADODARA QUESTION BANK SUB: COMPUTER SCIENCE(083) CHAPTER 6 Pointers 2 MARKS QUESTION 1. Rewrite the following codes after removing errors, if any, in the following