Online Class Room 4 HSST Computer Science Exam 2022

Source Code : Program written by Jasna (Using for loop )   Output

5. What are expressions? Expressions are constitutes by operators and operands to perform an operation. Based on the operators used, there are different types of expressions like , i). Arithmetic expressions Arithmetic expressions are also divided into a). Integer expression :All operands in the expressions are integers. An integer expression yields an integer result. b). Floating point (decimal ) expression: All operands in the expression are floating points(decimals).A floating point expression yields a floating point result. ii). Relational expression ; The relational expression consists of relational operators. They are also called conditions. iii). Logical expression : A logical expression is an expression whose value is either True or False. For example x>y is a logical expression, since it can be either ‘True’ or ‘False’.   6. What is type conversion? Type conversion means converting one data type to another data type. There are two types of type conversion, Implicit type

3. What are Data Types? These are means to identify the type of data and associated operations handling these data. Data types are classified into fundamental and user-defined data types. Fundamental data types represent atomic values and they include int, char, float, double and void. 4.What are type modifiers? Type modifiers are used to modify the size of memory space and range o data supported by the basic data types. Eg. long, short, signed, unsigned

2.Explain the rules for naming an identifier / variable ? a). It may contain an arbitrary long sequence of letters, digits and _(under score) b). First character must be letter or _ c). White space and special characters are not allowed. d). Key words can not be used. e). Upper and Lower case letters are treated separately(case sensitive). Assignment Identify the valid and invalid identifiers ( Give Reasons ) mark3, int , Class_name , 123school , school_name, for , school123, student name , student_name

I. What are token? What are different types of tokens used in C++? Tokens are the basic building blocks of a C++ program. There are five types of tokens in C++. 1. Key words : Key words are tokens that carry a specific meaning to the language compiler. Eg. int, switch etc.. 2. Identifiers : Identifiers are user defined words that are used to name different program elements such as memory locations, statements, functions, classes etc. Identifiers used for naming memory location is known as variables. Identifiers assigned to statements are known as labels. Identifiers used for set of statements are known as functions. 3. Literal : Literals are data items that never change their values during the program running. They are also known as constants. There are 4 types of literals a) Integer literal: tokens formed only by digits. It must have at least one digit and must not have decimal point. It may contain +ve or _ve sign as first character Eg. 15, -20, +40 b) Floating Po

Aim: To check whether a given number is positive , negative or zero #include<iostream> using namespace std; int main() { int n; cout<<"Enter a number"; cin>>n; if(n>0) cout<<"The number is positive"; else if(n<0) cout<<"The number is negative"; else cout<<"The number is zero"; return 0; }

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