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CBSE Class 12 Pre Board 2020 : Computer Science - Prelim 1 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL JAMMU ASSIGNMENT FOR PRE-BOARD-I(2019-2020) Class: XII Subject: Computer Science(283) Q1. Write the type of C++ Operators (Arithmetic, Logical, and Relational Operators) from thefollowing: (i) !(ii) !=(iii) &&(iv) % Q2. Observe the following program very carefully and write the name of those header file(s), which are essentially needed to compile and execute thefollowing program successfully: void main() { char text[20], newText[20]; gets(text); strcpy(newText,text); for(inti=0;i<strlen(text);i++) if(text[i] = = A ) text[i] = text[i]+2; puts(text); } Q3. Find and write the output of the following C++ program code: typedef char STRING[80]; void MIXNOW(STRING S) { int Size=strlen(S); for(int I=0;I<Size;I+=2) { char WS=S[I]; S[I]=S[I+1]; S[I+1]=WS; } for (I=1;I<Size;I+=2) if (S[I]>= M && S[I]<= U ) S[I]= @ ; } void main() { STRING Word= CBSEEXAM2019 ; MIXNOW(Word); cout<<Word<<endl; } Q4. What is a copy constructor? Illustrate with a suitable C++ example. Q5. Write the output of the following C++ code. Also, write the name of feature of Object Oriented Programming used in the following program jointly illustrated by the Function 1 to Function 4. voidMy_fun ( ) // Function 1 { for (int I=1 ; I<=50 ; I++) cout<< "-" ; cout<<end1 ; } voidMy_fun (int N) // Function 2 { for (int I=1 ; I<=N ; I++) cout<<"*" ; cout<<end1 ; } voidMy_fun (int A, int B) // Function 3 { for (int I=1. ;I<=B ;I++) cout<<A*I ; cout<<end1 ; } voidMy_fun (char T, int N) // Function 4 { for (int I=1 ; I<=N ; I++) cout<<T ; cout<<end1; } void main ( ) { int X=7, Y=4, Z=3; char C='#' ; My_fun (C,Y) ; My_fun (X,Z) ; } Q6. Define a class Ele_Bill in C++ with the following descriptions: Private members: Cname of type character array Pnumber of type long No_of_units of type integer Amount of type float. Calc_Amount( ) This member function should calculate the amount as No_of_units*Cost . Amount can be calculated according to the following conditions: No_of_units Cost First 50 units Free Next 100 units 0.80 @ unit Next 200 units 1.00 @ unit Remaining units 1.20 @ unit Public members: * A function Accept( ) which allows user to enter Cname, Pnumber, No_of_units and invoke function Calc_Amount(). * A function Display( ) to display the values of all the data members on the screen. Q.7 Write a user-defined function AddEnd4(int A[][4],intR,int C) in C++ to find and display the sum of all the values, which are ending with 4 (i.e., unit place is 4). 19 5 4 Q8. Write a user defined function in C++ to find the sum of both left and right diagonal elements from a two dimensional array. Q9. An array S[10] [30] is stored in the memory along the column with each of its element occupying 2 bytes. Find out the memory location of S[5][10], if element S[2][15] is stored at the location 8200. Q10. Write a function RevText() to read a text file Input.txt and Print only word starting with I in reverse order . Example: If value in text file is: INDIA IS MY COUNTRY Output will be: AIDNI SI MY COUNTRY Q11.Write a function in C++ to search and display details, whose destination is Cochin from binary file Bus.Dat . Assuming the binary file is containing the objects of the following class: class BUS { intBno; // Bus Number char From[20]; // Bus Starting Point char To[20]; // Bus Destination public: char * StartFrom ( ); { return From; } char * EndTo( ); { return To; } void input() { cin>>Bno>>; gets(From); get(To); } void show( ) { cout<<Bno<< : <<From << : <<To<<endl; } }; Q12. Write a function in C++ to add more new objects at the bottom of a binary file "STUDENT.dat", assuming the binary file is containing the objects of the following class : class STU { intRno; charSname[20]; public: void Enter() { cin>>Rno;gets(Sname); } void show() { count<<Rno<<sname<<endl; } }; Q13. State any one Distributive Law of Boolean Algebra and Verify it using truth table. Q14. Draw the Logic Circuit of the following Boolean Expression: ((U + V ).(U + W)). (V + W ) Q15. Reduce the following Boolean Expression to its simplest form using K-Map: F(X,Y,Z,W)= (0,1,2,3,4,5,8,10,11,14)

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