1. What does #include do. 2. What is preprocessor. 3. What does using namespace std do. Can we create our own namespace. 4. Who calls main function. Can we pass arguments in main function. 5. Write our own function to copy a char array to another. Function accepts two args: src and dest. 6. Write a void function getBit which accepts a bit position and return that bit of a number as bool. 7. Write a void function setBit which accepts a bit position and 0/1 (set as 0 or 1) and sets that bit with given 0 or 1. 8. WAP to overload operator + which adds two imaginary number and return resulted imaginary number.

Question

1. What does #include  do. 2. What is preprocessor. 3. What does using namespace std do. Can we create our own namespace. 4. Who calls main function. Can we pass arguments in main function. 5. Write our own function to copy a char array to another. Function accepts two args: src and dest. 6. Write a void function getBit which accepts a bit position and return that bit of a number as bool. 7. Write a void function setBit which accepts a bit position and 0/1 (set as 0 or 1) and sets that bit with given 0 or 1. 8. WAP to overload operator + which adds two imaginary number and return resulted imaginary number.

Accepted Answer

Technical interview questions for Associate Software Engineer position.

iostream header file is used for input/output operations in C++.
Preprocessor directives are executed before the compilation of the program.
using namespace std allows us to use standard C++ library functions without specifying the namespace each time.
Main function is called by the operating system. Arguments can be passed to main function.
char* strcpy(char* dest, const char* src) can be used to copy a char array to another.
bool getBit(int num, int pos) { return (num & (1 << pos)) != 0; }
void setBit(int &num, int pos, int bit) { num ^= (-bit ^ num) & (1 << pos); }
Imaginary operator+ can be overloaded as follows: Imaginary operator+(const Imaginary& a, const Imaginary& b) { return Imaginary(a.real + b.real, a.imag + b.imag); }

Accepted Answer

1. #include directive tells the C preprocessor to include the contents of the file specified in the input stream to the compiler and then continue with the rest of the original file.

2.a computer program that modifies data to conform with the input requirements of another program.

3.Namespace provide the space where we can define or declare identifier i.e. variable, method, classes. Using namespace, you can define the space or context in which identifiers are defined i.e. variable, method, classes.

4.Main function is called by the operating system. Arguments can be passed to main function.

5.char* strcpy(char* dest, const char* src) can be used to copy a char array to another.

6.bool Get Bit(int num, int pos) { return (num & (1 << pos)) != 0; }

7.void Set Bit(int &num, int pos, int bit) { num ^= (-bit ^ num) & (1 << pos); }

8.Imaginary operator+ can be overloaded as follows: Imaginary operator+(const Imaginary& a, const Imaginary& b) { return Imaginary(a.real + b.real, a.imag + b.imag); }

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