CS201 Current Midterm Paper Fall 2013 Questions Answers

using namespace std;

int main() {

int a[6]={2,1,3,15,20,50};
int i=++a[1];
int j=a[1]++;
int k=a[i++];
int l=a[--i]*i;
int m=a[++i]-1;
couti" "j" "k" "l" "m" ";

    return 0;
}

output

3  2  3  6  14

2. Bitwise operators to mention

&  =bitwise AND operator

 | =btwise OR operator

    ^ =bitwise Exclusive OR operator

   ~ =bitwise NOT operator

3. 

int A[5] = {1 , 2, 3, 4};

int i;

for (i=0; i<5; i++)

{

A[i] = 2*A[i];

Cout<< A[i] " ";

}

output

2   4   6   8   118

4.

What will be the output of the following; (5 marks)

void main()

{

union Num

{

int ValueI;

float ValueF;

double ValueD;

char ValueC;

};

Num TestVal = {100};

cout"Integer =" TestVal.ValueIendl;

TestVal.ValueF = 2.123;

cout "Float=" TestVal.ValueFendl;

cout"Uninitialzed double =" TestVal.ValueD endl;

cout"Some rubbish???"endl;

TestVal.ValueC = 'U';

cout"character=" TestVal.ValueCendl;

}

output

Integer = 100

Float= 2.123

Uninitializad double 5.30754e-315

Some rubbish???

Character = U

5.

#include <iostream.h>

main ()

{

int y[10] = {10,20,30,40,50,60,70,80,90,100};

int *yptr, i;

yptr = y;

cout*(yptr+1*2)endl;

}

output

30

    Q) what will be the Out put of
    int x=10;
    int y=30;
    int *xptr;
    xptr=&x;
    cout "x = " *xptr+x ; (Out put signs are present but cant write here )

   Answer:   x=20
Q))When a pointer is incremented then how many bytes will it move to change its address?  Ans:When a pointer is incremented, it actually jumps the number of memory addresses

►According to data type (Pg 160)

“If an integer occupies four bytes in the memory, then the yptr++; will increment its value by four. when we increment the yptr, it

points to the next integer in the memory”

It depends on the data type of the size. *ptr++ this pointer will point to the next element in the array.
  Q 3 : If ( char array [7], is a character array then write a char at fifth loction of this array.

char[4]=’a’;

Q 4 : Which function is used in  read & write while handling file.

ifstream inFile; // object for reading from a file

ofstream outFile; // object for writing to a file

1:intPtr  is  a  constant pointer to integer  155

int *const  intPtr= &x;

       2:intPtr  is  a  pointer  to  constant 

const  int *intPtr = &x;

q3:  Char  name []= " Hello  World";   

    size  of  array name ?

ans :12  including space and NULL character

double atof (const char *nptr)

Answer: page 191

Converts the string nPtr to double.

char *strcpy (char *s1,const char *s2)

Answer: page 192

Copies string s2 into character array s1. The value of s1 is returned.

q5  tel  the size  of  initialized  array

int  arr []={0,0,0,0}

ans: 4

--We are trying to open a txt file which does not exist with command (“myfile.txt”, ios::out);  (2 marks)

 Ofstream.out;

Out.open(“myfile.txt”, ios::out);

If(!out) { cout<<”not found”; exit(1);}

A new file will be created and now we have to add our data in this file.

---A two-dimensional array has 2 rows and 3 columns. Write down the syntax to initialize first element of all rows of two-dimensional array with value 3 (2 marks)

int num[2] [3] ;

num[0] [0] =3;

num[1] [0]=3 ;

num[2] [0]=3 ;

Q)) When a pointer is incremented,what happens in the following cases?page#172
a)single-dimensional array
b)two –dimensional array 3