Data Types and variables in C++.pptx

Data Types and variables in C++.pptx

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  DATA TYPES AND VARIABLESIN C++
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  Datatypes in C++ ◦Data type refer to the kind of data to be stored in variable. ◦ There are two types of data type ◦ Fundamentals/Built in datatype. ◦ Derived datatype/user defined datatype.
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  Fundamentals datatype ◦ Fundamentaldata types are the data types which are predefined in the language and can be directly used to declare a variable in C++. Example are: ◦ Int ,float,char,double,bool etc. Syntax: ◦ Datatype varible_name;
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  User defined datatype: ◦Data types that are derived from fundamental data types are derived types. For example: arrays, pointers, function types, structures, etc.
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  Data Type modifierin C++. • As the name suggests ,these are used to modify primitive data type i.e int,char,float. • They are used as a prefix to the primitive data types. • These modifiers change the size and the type of values that a primitive data type can hold. Examples are: singed int, unsigned int, short int etc.
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  Variables in C++ ◦Variables are containers for storing data values. ◦ Int -stores integers (whole numbers), without decimals, such as 123 or -123. ◦ double- stores floating point numbers, with decimals, such as 19.99 or -19.99 ◦ char-Stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes. ◦ string-stores text, such as "Hello World". String values are surrounded by double quotes ◦ Bool-Stores values with two states: true or false.
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  Declaring variable andinitializing variable ◦ To create a variable, specify the type . ◦ Syntax; datatype varible_name; ◦ Example: int number; Initializing a variable: To create a variable, specify the type and assign it a value: ◦ Syntax; datatype varible_name=value; ◦ Example: int number=10;
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  a 10 20 b Memory Value Value Variable/Memory location Variable/Memory location 4byte 4byte Taking size of4 byte in memory Memory Allocation:
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  Implantation: • Checking sizeof datatype. • Declaring variable. • Initializing variable. • Taking value from user. • Putting invalid value in a datatype