DATA TYPES IN C++…
DATA TYPES IN C++
Data Type என்பது ஒரு variable எந்த வகையான data-ஐ store செய்ய வேண்டும் என்பதை compiler-க்கு தெரிவிக்கும் type. Simple definition: A data type specifies what kind of value a variable can store.
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Definition
Data Type என்பது ஒரு variable எந்த வகையான data-ஐ store செய்ய வேண்டும் என்பத……
Explanation
Example
int age = 25; இங்கு: int → Data type age → Variable / Identifier ……
Simple Explanation
Real life-ல் different containers different things-க்கு use செய்வோம். Water bottle → Water Rice bag → Rice Mo……
Explanation
Why data type is needed
Consider: int marks = 90; Compiler தெரிந்து கொள்கிறது: marks → Integer value Another example: char grade = 'A……
Explanation
Classification of c++ data types
C++ data types broadly: Data Types │ ├── 1. Fundamenta……
FUNDAMENTAL / BASIC DATA TYPES
Explanation
Main basic data types: int char float……
Definition
int integer numbers store செய்ய பயன்படும். Int……
Explanation
Syntax
int variable_name; int age = ……
Explanation
return 0; }…
Important
int normally whole number. Correct: int marks = 90; But: int value = 10.75; இங்கு dec……
Definition
float decimal / fractional nu……
Explanation
Example
float price = 25.50f; Other example……
Explanation
return 0; }…
Important
Float important
float single-precision floating-p……
Explanation
Example
float x = 3.141592f;…
Definition
double decimal values-ஐ float……
Explanation
Example
double pi = 3.141592653589793;…
Comparison
Float vs double
float a = 3.14f; double b = 3.141592653589793; Simple difference: float → Le……
Explanation
return 0; }…
Default cout formatting may n……
Definition
char ஒரு single character sto……
Explanation
Example
char grade = 'A'; Character single quotes-ல் எழுத வேண்டும். Corre……
Real Life Example
Char examples
char grade = 'A'; char symbol……
Important
char digit = '5'; இதில் '5' n……
Explanation
return 0; }…
Explanation
Char memory
char usually occupies: 1 byte C++ standard guarantees: sizeo……
Definition
bool logical values store செய……
Explanation
Example
bool passed = true;…
Explanation
return 0; } Usually output: 1……
Explanation
Bool with boolalpha
If we want words: #include using ……
Definition
void means: No value / no type o……
Program
Example
Explanation
display() function எந்த value……
Real Life Example
Void example
#include using namespace std;……
Important
This is invalid as a normal object declarat……
Explanation
Integer type modifiers
C++ integer types-க்கு modifiers use ……
Explanation
Signed
int normally signed by default. signed int x = ……
Explanation
Unsigned
unsigned negative values represent செய்ய பயன்படாது. u……
Comparison
Signed vs unsigned
Explanation
Example
signed int a = -10; unsigned ……
Explanation
Short int
Small integer type. short int……
Explanation
Long int
Larger or at least not smaller than int in ran……
Explanation
Long long
For still wider integer range……
Explanation
Integer type relationship
C++ guarantees at least: short ≤ int ≤ long ≤ long long in ter……
Explanation
Common size values
On many modern systems, commo……
Important
Except for char being exactly 1 byte by definition, ex……
Explanation
Sizeof operator
To find actual size: #include……
Output
Possible output
This can vary by system.…
Concept
Range concept
Every data type has a range. For a common 32-bit int: -2,147,483,648 to 2,147,483,647 Typical unsign……
Explanation
Floating types
C++ floating-point types: flo……
Explanation
Long double
Higher or at least no less precision/range than double, depending……
Explanation
Literal suffixes
Useful exam point: 10 → int literal 10L……
3.14 → double literal
3.14f → float literal 3.14L →……
Important
String - important
string is commonly used in C++: string name = "Ravi"; But important tec……
Program
Example
Explanation
return 0; }…
Summary
Fundamental data types summary
int → Integer float → Decimal double → Higher pr……
DERIVED DATA TYPES
Summary
Derived data types basic types-லிருந்து உ……
Explanation
Array
Same type values-ஐ collection ஆக store செய்கிறது. int marks[……
Explanation
Pointer
Another object-ன் memory address-ஐ store செய்கிறது. int ……
Explanation
Reference
Existing variable-க்கு another name / alias. int x = 10; int &ref = x;……
USER-DEFINED DATA TYPES
Explanation
Programmer உருவாக்கும் types. M……
Program
Example
Explanation
Student programmer-created type. struct ……
Explanation
Union
Same memory area-ஐ multiple members sha……
Important
At a given time, the active m……
Explanation
Enum
Named integral constants define செய்ய பயன……
Explanation
Type alias
We can give another name to a type. Using typedef: ty……
Table
Data type classification table
Program
Program - multiple data types
Explanation
return 0; }…
Explanation
int age = 25; int → whole number. float height = 5.8f; float → decimal value. double salary = 35000.75; doubl……
Explanation
Type conversion
ஒரு data type-லிருந்து another type-……
Explanation
This is implicit conversion.…
Explanation
Implicit conversion
Compiler automatically convert செய்க……
Explanation
Explicit conversion
Programmer manually convert செய்கிறார். Modern C++: ……
Common Mistake
Important type conversion error
double x = 9.99; int y = x;…
Output
Possible result
Not: 10 Integer conversion di……
Explanation
Auto data type
Modern C++ supports: auto x = 10; Compiler infers: x → int ……
Important
Auto important
auto does not mean variable has no data typ……
Explanation
Example
const int MAX = 100; Here: const → ……
Real Life Example
Signed and unsigned example
signed int a = -100; unsigned……
Remember
signed → Negative + Positive unsi……
Explanation
Example
int marks = 90; int → Data type marks → Variable / identifier 90 → Value Do not confuse. [DATA TYPE……
Common Mistake
Error 1
Character quotation Wrong: ch……
Common Mistake
Error 2
Decimal into int int x = 10.9; x……
Common Mistake
Error 3
Using text with char Wrong: char name = 'Ravi'……
Common Mistake
Error 4
Boolean confusion Correct: bool status = true; Not:……
Dry Run
Consider: int age = 20; double percentage = 89.75; char grade = 'A'; bool pass = true; Comp……
Comparison
[FLOAT vs DOUBLE]
Comparison
[CHAR vs STRING]
Comparison
[INT vs FLOAT] int a = 10; St……
Remember
int → Integer float → Decimal double → More preci……
Remember
I F D C B V I → int F → float D → double C → char B → ……
TRB Point
What is a data type? A data type specifies the type of data……
TRB Point
C++ data types
1. Fundamental 2. Derived 3. ……
TRB Point
Examples: Fundamental → int, char, float, double, bool ……
Interview Point
Is string a primitive/fundamental C++ data type? No. std::s……
Interview Point
Is int always 4 bytes? No. int size is implementation-dependent. Many m……
Interview Point
Difference between float and double? double normally ……
MCQ
Which data type stores intege……
MCQ
Which is used for a single ch……
MCQ
Which is a valid Boolean valu……
MCQ
Which normally provides more ……
MCQ
Which type indicates no retur……
MCQ
Which is correct?…
MCQ
Which is a derived data type?…
MCQ
Which is a user-defined type?…
MCQ
Which statement is technicall……
MCQ
Which operator tells the stor……
Practice
Identify the data type: int age = 25; float weight = 65.5f; double pi = 3.141……
Practice
Practice 2
Choose suitable type: Student age → int Student grade → c……
Summary
C++ Data Type A data type tells the compiler what kind of value a variable can store. Main basic types: int →……
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