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Class 11 (22-01-2021) only for Computer Science Students

  ☺Note: All Questions are note it in your copy.

Question No-1: Evaluate the following C++ expressions where a, b, c are integers and d, f are floating point numbers. The Value of a = 6, b = 2, d = 1.5 
a) f = a + b/a
b) c = ( a++) * d + b
c) c = a – ( b++ ) * (–a)

Question No:2 Explain Unary,Binary and Ternary Operators? Give Example of each type.

Answer:-

          Unary Operators: Operators that operates or works with a single operand are unary operators.
 Example: (++, –)


Binary Operators: Operators that operates or works with two operands are binary operators.
Example: +, –, *, /.
 Example: +, –, *, /.  


    Ternary Operator: These operator requires 3 expressions or operands to function.
Example: Conditional operator- Expression1 ? Expression2 : Expression3 .
Here, Expression1 is the condition to be evaluated. If the condition(Expression1) is True then we will execute and return the result of Expression2 else return the result of Expression3.


 Example: Conditional operator- Expression1 ? Expression2 : Expression3 .
 Here, Expression1 is the condition to be evaluated. If the condition(Expression1) is True then we will execute and return the result of Expression2 else return the result of Expression3.


Question: Write difference between keyword and identifier. 

Keywords:



 1) Keywords are pre-defined or reserved words in a programming language
2) Each keyword is meant to perform a specific function in a program. Since keywords are referred names for a compiler, they can’t be used as variable names.
3) C language supports 32 keywords while in C++ there are 31 additional keywords other than C Keywords.



Identifiers:
1) Identifiers are used as the general terminology for naming of variables, functions and arrays.
2) These are user defined names consisting of arbitrarily long sequence of letters and digits with either a letter or the underscore(_) as a first character. Identifier names must differ in spelling and case from any keywords.
3) There are certain rules that should be followed while naming c identifiers:
They must begin with a letter or underscore(_).
They must consist of only letters, digits, or underscore. No other special character is allowed.
It should not be a keyword.
It must not contain white space.
It should be up to 31 characters long as only first 31 characters are significant.


Question 4:- Write a function in C++ having 2 parameters x


 and n of integer type with result type float to find the sum


 of following series :-

1 + x/2! + x2/3! +…………………..+xn/(n+1)! 3

 


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