DCT1063 P2 PRE-TEST

A	The & operator will returns the memory address of its operand.	T/F
B	The * operator will returns the value of the variable located at the address specified by its operand.	T/F
C	In C++, there is a close relationship between pointers and arrays.	T/F
D	Consider the following fragment: int no[3]={0,1,2}; int *p1; p1 = no; the statement no[1] or *(p1+1) will output the different result.	T/F
E	Both statements (in D) will return the 1st element of array no .	T/F
F	In order to perform file I/O, you must include the header <string.h> in your program.	T/F
G	To open an output stream, you must declare the stream to be of class ofstream.	T/F
H	A stream that will be performing both input and output operations must be declared as class ifstream.	T/F
I	The following fragment opens a file called out; ofstream out; out.open("test.txt");	T/F
J	To close a file, use the member function close( ).	T/F

 

SECTION B –Show Output

1. What is output by the following program segment?

 

1 int number = 9;

2 int *p = &number; // address of number is 0010FF8C

3

4cout << number << " " << *p << " " << p;

(4 Marks)

answer

 

 

 

 

 

2. What is output by the following program segment?

 

1 int a[] = { 1, 3, 5, 7, 9 };

2 int *p = a;

3

4 cout << a[ 0 ] << " " << *( p + 1 ) << " " << p[ 2 ];

(4 Marks)

 

answer:

 

 

 

 

3. What is output by the following program segment?

 

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

2 int *p = a;

3

4 cout << a[ 0 ];

5 cout << *(a+1);

6 cout << *(p + 2);

7 cout << p[ 3 ];

(5 Marks)

 

answer:

 

 

 

 

 

 

 

 

4. What is output by the following program segment?

 

1 int i,a[] = { 1, 2};// address of a[0] is 5000

2 int *p = a;

3

4 for(i=0;i<=1;i++)

5

6 cout << (p+i)<<" "<<*(p+i)<<endl;

(3 Marks)

 

answer

 

 

 

SECTION C –Programming

 

1. Consider the following C++ program. Show the content of test.txt
   
   
   

   #include <iostream>
   

   #include <fstream>
   

   using namespace std;
   

   int main()
   

   {
   

   ofstream out("test.txt");
   

   out << 10 << " " << 123.23 << "\n";
   

   out << "This is a short text file.";
   

   out.close();
   

   return 0;
   

   }
   

 

 

 

2. Write a program that prompts user to enter:-

 

1. Name
   
2. Age
   
3. State
   
4. Country
   

 

and write into a file named biodata.txt as follows.

 

Name     : Ahmad Ashraaf

Age    : 19

State: terengganu

Country: Malaysia

 

 

 

(10 Marks)