Study MaterialsImportant QuestionsImportant Questions for Class 12 Computer Science (C++) – Pointers

Important Questions for Class 12 Computer Science (C++) – Pointers

Important Questions for Class 12 Computer Science (C++) – Pointers

Previous years Examination Questions
2 Marks Questions

Question 1:
Obtain the output from the following C++ program as expected to appear on the screen after its execution. Delhi 2014
Important Note:
All the desired header files are already included in the code, which are required to run the code.

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    void main()
    {
    char*String="SARGAM"; 
    int *Ptr, A[]={l,5,7,9};
    Ptr=A; 
    cout<<*Ptr<<String<<endl;
    String++;
    Ptr+=3;
    cout<<*Ptr<<String<<endl;
    }

    Аnswer:
    Output of the given program will be
    1SARGAM
    9ARGAM

    Question 2:
    Obtain the output from the following C+ + program as expected to appear on the screen after its execution. All India 2014.2013
    Important Note:
    All the desired header files are already included in the code, which are required to run the code.

    void main()
    {
    char *Text = "AJANTA"; 
    int *P,Num[] = {11,5,7,9};
    P = Num;
    cout<<*P<<Text<<endl;
    Text++;
    P++;
    cout<<*P<<Text<<endl;
    }

    Аnswer:
    Output of the given program will be
    1AJANTA
    5JANTA

    Question 3:
    Observe the following C+ + code carefully and obtain the output, which will appear on the screen after execution of it.
    Delhi 2013
    Important Note:

    All the desired header files are already included in the code, which are required to run the code.

    void main()
    {
    char *String = "SHAKTI"; 
    int *Point, Value[]={10,15,70,19};
    Point = Value;
    cout<<*Point<<String<<endl;
    String++;
    Point++;
    cout<<*Point<<String<<endl;
    }

    Аnswer:
    Output of the given program will be
    10SHAKTI
    15HAKTI

    Question 4:
    Give the output of the following program segment: (Assuming, all desired header file(s) are already included). Delhi 2013C

    void main()
    {
    float *Ptr,Points[] = {120,50,30,40,10};
    Ptr=Points; 
    cout<<*Ptr<<endl;
    Ptr+=2;
    Points[2]+=2.5; 
    cout<<*Ptr<<endl:
    Ptr++;
    (*Ptr)+=2.5; 
    cout<<Points[3]<<endl;
    }

    Аnswer:
    Output of the given program will be
    20
    32.5
    42.5

    Question 5:
    Find the output of the following program: All India 2012

    #include<iostream.h> 
    #include<conio.h>
    #include<ctype.h> 
    typedef char Str80[80]; 
    void main() 
    {
    char *Notes;
    Str80 Str="vR.zGooD";
    int L=6;
    Notes = Str; 
    while(L>=3)
    {
    Str[L]=isupper(Str[L])?
    tolower(Str[L]); 
    toupper(Str[L]); 
    cout<<Notes<<endl;
    L--;
    Notes++; 
    getch();
    }
    }

    Аnswer:
    Output of the given program will be
    vR.zGoOd
    R.zGOOD
    .zgOOD
    ZgOOD

    Question 6:
    Find the output of the following program: Delhi 2012

    #include<iostream.h> 
    #include<conio.h>
    #include<ctype.h> 
    typedef char Txt80[80]; 
    void main()
    {
    char *PText; 
    Txt80 Txt="Ur2GReAt"; 
    int N=6;
    PText=Txt:
    while(N>=3)
    {
    Txt[N]=isupper(Txt[N])? 
    tolower(Txt[N]);
    toupper(Txt[N]); 
    cout<<PText<<endl;
    N--;
    PText++;
    }
    }

    Аnswer:
    Output of the given program will be
    Ur2GReat
    r2GREat
    2GrEat
    grEat

    Question 7:
    In the following program, what will be the possible output(s) from the following options (i), (ii), (iii) and (iv)? Justify your answer. Delhi 2011C

    #include<iostream.h> 
    #include<stdlib.h> 
    #include<string.h> 
    #include<conio.h> 
    void main()
    {
    clrscr();
    char *Text="1234"; 
    int L=strlen(Text);
    randomize(); 
    for(int I=0;I<L;I++)
    {
    int Start=random(I)+1; 
    char P=Text[Start]; 
    cout<<P<<":";
    }
    getch();
    }
    (i) 1:3:2:4: 
    (ii) 2:2:3:2:
    (iii) 2:2:4:4: 
    (iv) 2:2:2:3:

    Аnswer:
    The possible output will be (ii) 2:2:3:2: and (iv) 2:2:2:3:

    Question 8:
    Find the output of the following program : Delhi 2011

    #include<iostream.h>
    #include<conio.h> 
    void main()
    {
    int Track[] = {10, 25, 30, 55},*Striker; 
    Striker = Track;
    Track[1] += 30;
    cout<<"Striker"<<*Striker<<endl; 
    *Striker -= 10;
    Striker++;
    cout<<"Next@"<<*Striker<<endl;
    Striker += 2;
    cout<<"Last@"<<*Striker<<endl; 
    cout<<"Rest To"<<*Striker[0]<<endl;
    }

    Аnswer:
    There is an error in last line, i.e. *Striker[0], so the program will not run. In case, if there is no subscript in Striker pointer, then the output would be
    Striker10
    Next@55
    Last@55
    Rest To55

    Question 9:
    Find the output of the following program: All India 2011

    #include<iostream.h> 
    #include<conio.h>
    void main()
    {
    int *Queen, Moves[]={11, 22, 33,44};
    Queen = Moves;
    Moves[2] += 22; 
    cout<<"Queen @"<<*Queen<<endl;
    *Queen -= 11;
    Queen += 2;
    cout<<"Now@"<<*Queen<<endl;
    Queen++;
    cout<<"Finally@"<<*Queen<<endl; 
    cout<<"New 0rigin@"<<*Moves[0]<<endl;
    }

    Аnswer:
    There is an error in last line, i.e. *Moves[0], so the program will not run. In case, if there is no subscript in Moves pointer, then the output would be
    Queen @11
    Now@55
    Finally@44
    New 0rigin@0

    Question 10:
    Find the output of the following program:

    #include<iostream.h> 
    #include<conio.h> 
    void main()
    {
    int Numbers[]={2,4,8,10}; 
    int *ptr = Numbers; 
    for(int c=0;c<3;c++)
    {
    cout<<*ptr<<"@";
    ptr++;
    }
    cout<<endl;
    for(c=0:c<4:c++)
    {
    (*ptr) *= 2;
    --ptr;
    }
    for(c=1:c<4;c++)
    cout<<Numbers[c]<<"#";
    cout<<endl;
    }

    Аnswer:
    Output of the given program will be
    2@4@8@
    8#16#20#

    Question 11:
    Find the output of the following program:

    #include<iostream.h> 
    #include<conio.h> 
    void main()
    {
    int Array[]={4,6,10,12}; 
    int *pointer = Array; 
    for(int i=1;i<=3;i++)
    {
    cout<<*pointer<<"#";
    pointer++;
    }
    cout<<endl; 
    for(i=1;i<=4;i++)
    {
    (*pointer) *= 3;
    --pointer;
    }
    for(i=l;i<5;i++)
    cout<<Array[i-1]<<"@"; 
    cout<<endl;
    }

    Аnswer:
    Output of the given program will be
    4#6#10#
    12@18@30@36@

    Question 12:
    Give the output of the following program segment. (Assume, all required header files are included in the program.)

    void main()
    {
    int a=32,*X=&a;
    char ch=65, &eco=ch; 
    eco+=a;
    *X+=ch;
    cout<<a<<','<<ch<<endl;
    }

    Аnswer:
    Output of the given program will be
    129,a

    Question 13:
    Identify the syntax error(s), if any, in the following program. Also, give reason for errors.

    void main()
    {
    const int i=20;
    const int *const ptr=&i;
    (*ptr)++;
    int j=15;
    ptr=&j;
    }

    Аnswer:
    (*ptr)++ cannot modify a const object ptr-&j cannot modify a const object.

    Question 14:
    Give the output of the following program segment. (Assume, all required header files are included in the program.)

    void main()
    {
    int array[] = {2,3,4,51}; 
    int *arptr=array;
    int value=*arptr; 
    cout<<va1ue<<'\n'; 
    value=*arptr++; 
    cout<<value<<'\n'; 
    value=*arptr; 
    cout<<value<<'\n'; 
    value=*++arptr; 
    cout<<value<<'\n'; 
    }

    Аnswer:
    Output of the given program will be
    2
    2
    3
    4

    Question 15:
    Give the output of the following program segment. (Assume, all required header files are included in the program.)

    void main()
    {
    char *s="GOODLUCK";
    for(int x=strlen(s)-1;x>=0;x--) 
    {
    for(int y=0;y<=x;y++) 
    cout<<s[y]; 
    cout<<endl;
    }
    }

    Аnswer:
    Output of the given program will be
    GOODLUCK
    G00DLUC
    G00DLU
    GOODL
    GOOD
    GOO
    GO
    G

    Question 16:
    Give the output of the following program segment. (Assume, all required header files are included in the program).

    void main()
    {
    char *NAME="a ProFile"; 
    for(int x=0;x<strlen(NAME);x++) 
    if(islower(NAME[x])); 
    else
    if(isupper(NAME[x])) 
    if(x%2!=0)
    NAME[x]=tolower(NAME[x-l] 
    else
    NAME[x]--;
    cout<<NAME<<endl;
    }

    Аnswer:
    Output of the given program will be
    a Orooile

    Question 17:
    Find and write the output of the following C++ program code: All India 2017
    NOTE Assume all required header files are already being included in the program.

    void main()
    {
    int *Point, Score[]={100,95,150,75,65,120};
    Point=Score; 
    for(int L=0;L<6;L++)
    {
    if((*Point)%10==0) 
    *Point /= 2; 
    else
    *Point -= 2; 
    if((*Point)%5==0) 
    *Point /= 5; 
    Point++;
    }
    for(int L=5;L>=0;L--)
    cout<<Score[L]<<"*";
    }

    Аnswer:
    Given program will give error, i.e. Multiple declaration for ‘L’
    If we remove int from 2nd for loop then output will be:
    12*63*73*15*93*10*

    Question 18:
    Find the output of the following program: Delhi 2012C

    #include<iostream.h> 
    void main() 
    {
    int Points=300; 
    int *Start=&Points; 
    int *End;
    End=new int;
    (*End)=Points-150:
    Points+=100;
    cout<<Points<<":"<<*Start<<endl; 
    cout<<*End<<endl;
    Start=End;
    cout<<Points<<":"<<*Start<<endl; 
    cout<<*End<<endl;
    Points-=100;
    *Start-=50;
    cout<<Points<<":"<<*Start<<endl; 
    cout<<*End<<endl; 
    delete End;
    }

    Аnswer:
    Output of the given program will be 400:400
    150
    400:150
    150
    300:100
    100

    Question 19:
    Find the output of the following program Delhi 2009

    #include<iostream.h> 
    #include<conio.h> 
    void main()
    {
    int X[]={10, 25, 30, 55, 110}; 
    int *p=X; 
    whi1e(*p<110)
    {
    if(*p%3!= 0)
    *p = *p+1; 
    else
    *p = *p+2; 
    p++:
    }
    for(int 1=4;I>=1;I--)
    {
    cout<<X[I]<<"*"; 
    if(I%3 == 0) 
    cout<<endl;
    } 
    cout<<X[0]*3<<endl;
    }

    Аnswer:
    Output of the given program will be
    110*56*
    32*26*33

    Question 20:
    Find the output of the following program. Delhi (C) 2009

    #include<iostream.h> 
    #include<conio.h> 
    struct score
    {
    int Year; 
    float topper;
    };
    void Change(score *s, int x=20)
    {
    s->topper=(s->topper+25)-x; 
    s->Year++;
    }
    void main()
    {
    score Arr[]={{2007, 100},{2008, 951}};
    score *Point=Arr;
    Change(Point, 50); 
    cout<<Arr[0].Year<<"#"<<Arr[0].topper<<endl; 
    Change(++Point);
    cout<<Point->Year<<"#"<<Point->topper<<endl;
    }

    Аnswer:
    Output of the given program will be
    2008#75
    2009#100

    Question 21:
    Find the output of the following program. All India 2009

    #include<iostream.h>
    #include<conio.h> 
    void main()
    {
    int A[] = {10, 15, 20, 25. 30}; 
    int *p = A; 
    whi1e(*p<30)
    {
    if(*p%3!= 0)
    *p = *p+2;
    else
    *p = *p+1;
    P++;
    }
    for(int J=0;J<=4;J++)
    {
    cout<<A[J]<<"*"; 
    if(J*3 == 0) 
    cout<<endl;
    }
    cout<<A[4]*3<<endl;
    }

    Аnswer:
    Output of the given program will be
    12*
    16*22*27*
    30*90

    Question 22:
    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 SCounter)
    {
    char *Ptr = Text;
    int Length = strlen(Text); 
    for(;Counter<Length-2;Counter+=2,Ptr++)
    {
    *(Ptr+Counter)=toupper(*(Ptr+Counter));
    void main()
    {
    int Position=0;
    char Message[]="Pointers Fun"; 
    ChangeString(Message, Position); 
    cout<<Message<<"@"<<Position;
    }

    Аnswer:
    Output of the given program will be
    PoiNteRs Fun@10

    Question 23:
    What will be the output of the following program?

    #include<iostream.h>
    #include<ctype.h>
    #include<conio.h>
    #include<string.h> 
    void NewtextCchar String[],int &Position)
    {
    char *Pointer=String;
    int Length=strlen(String);
    for(;Position<Length-2;Position+=2,Pointer++)
    {
    *(Pointer+Position)=toupper(*(Pointer+Position));
    }
    }
    void main()
    {
    clrscr();
    int Location=0;
    char Message[]="Dynamic Act";
    Newtext(Message, Location);
    cout<<Message<<"#"<<Location;
    }
    

    Аnswer:
    Output of the given program will be
    DynAmiC ACt#10

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