Tokens and Control Structure in C++

1. Which one of the following is an ANSI C keyword?
   • public
   • operator
   • export
   • volatile
2. Which one of the following is not a C++ keyword?
   • constant
   • false
   • explicit
   • throw
3. Which of the following statements is TRUE with regard to naming C++ identifiers?
   • A name can start with any letter or digit.
   • No special characters are permitted.
   • Uppercase and lowercase letters are distinct.
   • A name cannot have more than 32 characters
4. Which of the following is a valid C++ identifier?
   • Total value
   • 2 x
   • _string1
   • template
5. Which of the following is not a valid literal constant in C++?
   • “ANSI C++”
   • 0X5
   • 12, 345
   • 9.234L
6. Which of the following is a user-defined data type in C++?
   • array
   • enumeration
   • void
   • function
7. Which of the following is not a built-in data type in C++?
   • structure
   • void
   • char
   • long double
8. Which of the following program segments is valid in C++?
   • a) void *p1; char *p2; p2 = p1;
   • b) void *p1; int *p2; *p2 = *p1;
   • C) void *p1; char *p2; p2 =(char*)p1;
   • d) enum colour {red, blue}; colour background; background = 1;
9. Assuming that we are working an a 16-bit word machine, which of the following takes a size of 8 bytes
   • signed long int
   • long int
   • long double
   • double
10. Which of the following declaration statements is illegal?
    • const int m = 10;
    • const int count;
    • const m = 100;
    • int const *p = &x;
11. Which of the following statements is FALSE?
    • All variables must be declared before they are used
    • All variables must be given a type when they are declared
    • A variable can be declared anywhere in the scope
    • A variable must be initialized at the time of its declaration
12. Identify the error, if any, in the statement: long sum = m1 + m2;
    • Declaration cannot contain any expression
    • Initialization at the time of declaration is not valid.
    • Type specification is incomplete.
    • No error
13. Which of the following statements is invalid?
    • int p = new int ;
    • int *p = new int ;
    • int *p = new int [10] ;
    • int *p = new int [m] [10] ;
14. For using the manipulator setw(), we must include the header file:
    • <iostream>
    • <cstdio>
    • <iomanip>
    • <cstdlib>
15. The following statements implement type cast operation. Which one of them is illegal?
    • x = y/(float)m;
    • x = y/float(m);
    • x = float(y)/(float)m;
    • x = y/float m;
16. The statement a=(b=10) – 5; is an example of
    • Chained assignment
    • Embedded assignment
    • Compound assignment
    • None of the above
17. Which one of the following expressions is an example of bitwise expression?
    • x>=y
    • x==10 && y<5
    • x << 10
    • x + = 10
18. Which of the following operators in C++ can be overloaded?
    • Conditional operator (?:)
    • Scope resolution operator (::)
    • Member access operator (.*)
    • Relational Operator (<=)
19. In which of the following groups all the operators are in the same level of precedence?
    • <<, < =, = =, << =
    • new, sizeaf, typeid, !
    • new, delete, ->, ::
    • %, *, ->*, /=
20. Which of the following loop structures is known as an exit-controlled loop?
    • do… while loop
    • while loop
    • for loop
    • None of the above

Answers:

1. volatile
2. constant
3. No special characters are permitted.
4. _string1
5. 12, 345
6. enumeration
7. structure
8. void *p1; char *p2; p2 =(char*)p1;
9. double
10. const int count;
11. A variable must be initialized at the time of its declaration
12. Type specification is incomplete.
13. int p = new int ;
14. <iomanip>
15. x = y/float m;
16. Embedded assignment
17. x << 10
18. Scope resolution operator (::)
19. <<, < =, = =, << =
20. do… while loop