CS201 Final Term Solved Subjective Set 3 by Junaid

Q1. How can we overcome the issue of dangling reference in a program?

Answer: We can avoid the dangling pointer errors by initialize pointer to NULL, after de-allocating memory, so that pointer will be no longer dangling. Assigning NULL value means pointer is not pointing to any memory location. Pointers The Pointer in C is a variable that stores address of another variable. A pointer can also be used to refer to another pointer function.

Q2. // what will be output of the program below?

int main ()

int i =2;

int j =3;

int k=2*++i*j++;

cout<<k;

3. What is overloading declaration for a stream extraction (>>) for an integer.

Answer: C++ is able to input and output the built-in data types using the stream extraction operator >> and the stream insertion operator <<. The stream insertion and stream extraction operators also can be overloaded to perform input and output for user-defined types like an object.

4. Suppose an object of class A is declared as data member of class B.

•  The constructer of which class will be called first?
•  The distracter of which class will be declared first?
•  A
•  B

5. //identify and correct error(s) in given code. while (c<=5);

sum + =c; c ++;

Answer: Logical error

6. Identify each of the following as system software and application software.

Answer: LINUX, DISK CLEANUP, WORD PROCESSOR, WINDOWS, STUDENT INFORMATION

System software: - Linux, Disk cleanup, windows. Application software: - Word Processor, Student information

Q7. //what will be the output of the following code snippet?

int x=10; int &y=x; y+=5; cout<<x;

Q8. Write a function named sum which accepts an integer in the function use a static variable to add the passed to it as arguments with each function call in the end, display the sum of values passed as arguments?

int main(){