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Summary Class 12 Computer science Notes cbse
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class 12 cbse computer science with python read only 100 pages detail explanation and all important questions
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Board NotesClass XIIth
Computer Science
S.No.
1 Review of C++ 1
2 Objected Oriented Programming in C++ 16
3 Arrays 27
4 Linked list, Stacks, Queues 33
5 Data File Handling 46
6&7 Database and SQL 57
8 Boolean Algebra 80
9 Networking 86
,
, Vidyamandir Classes
CHAPTER - 1 Review of C++
1. What is the difference between ‘a’ and “a” in C++?
Sol. Characters enclosed in single quotes are character contains in C++. Thus ‘a’ is a character contant.
Characters enclosed in double quotes are string-literals which are array of characters. Thus “a” is a string i.e, in
memory “a” is represented as “a\0” where \0 (null) character is the terminator of the string.
The size of ‘a’ is 1 character whereas the size of “a” is 2 characters.
2. What is a reference variable? What is its use?
Sol. A reference variable is an alias name for a previously defined variable. The usage of it is that the same data object can
be referred to by two names and these names can be used interchangeably.
3. What is the difference between 25L and 25?
Sol. An l(small L) or L suffix indicates it is long integer constant. Thus 25L is a long integer constant and 25 is an integer
constant.
4. Arrange the following data types from smallest to largest : float, char, double, long double, long, short, int.
Sol. char, short, int, long, float, double, long double.
5. What is wrong with the following statement?
const int y ;
Sol. In the above statement, the constant has been declared but not initialized. Thus, the correct statement may be
const int y = 0; // (Any integer value can be stored in y).
6. How is integer 024 different from integer 24?
Sol. The integer 024 represents an octal number which is equivalent to 20 in decimal number system. The integer 24
represents number 24 in decimal number system which is equivalent to 030 in octal number system.
7. Which of the following two statements are valid? Why? Also write their results.
int x ;
(i) x = 1,024 ; (ii) x = (1,024)
Sol. (i) Invalid because an integer constant does not contain commas.
(ii) Valid. The x will be having value 024, the result of comma operator. (Left to right evaluation are choices
compiler).
8. What will be result of following if ans = 6 initially?
(a) cout << ans = 8 ; (b) cout << ans == 8 ;
Sol. (a) 8 ; (b) 0 (which means false)
9. What is the similarity and difference between break and continue statements?
Sol. Similarity : Both break and continue are jump statements.
Difference : The break statement terminates the entire loop execution whereas continue statement terminates single
pass of the loop and jumps to the next counter.
VMC | Board Notes 1 Computer Science
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