What are primitive data types in C++?

What is a variable?

**Variables** are a fundamental part of programming. In C++, a **data type** is used to declare or define each variable. For instance, if a variable can hold integers or if it can also store other symbols.

Primitive data types

The following data types are frequently used in C++: - `int`: This is used to store integer values such as `1`, `-1`, `7`, etc. ```C++ int i = 5; ```

float and double: Both these data types store floating point values such as 1.56, 2.87, -4.7, etc. The difference between these two data types is the size. We can store up to 8 bytes in a double variable while only 4 in a float variable.
```
float f = 5.65;
double d = 7.8987;
```
bool: This is used to store two states: true/1 or false/0. If we want to store a number with a more significant value, our choice would be double.
```
bool b = true;
// or we can also declare bool as this
bool b = 0;
```
char: This is used to store a single character value such as a, A, #, etc.
```
char c = 'A';
```
string: This is used to store text such as Welcome to Educative, @Answers, etc.
```
string s = "This is a string";
```

#include <iostream>
#include <string>
using namespace std;
int main() 
{
  int number = 5;
  float decimal1 = 5.87;
  double decimal2 = 87.0987;
  bool state1 = true;
  bool state2 = 0;
  char letter = 'A';
  string text = "Welcome to Educative";
  cout << "The integer value is: " << number << endl;
  cout << "The float value is: " << decimal1 << endl;
  cout << "The double value is: " << decimal2 << endl;
  cout << "We can write boolean value in two forms as: " << state1 << " and " << state2 << endl;
  cout << "The character value is: " << letter << endl;
  cout << "The string value is: " << text << endl;
  return 0;
}

Explanation

- **Line 2:** We'll add `#include ` library for using `string`. - **Line 7:** Initialize an `int` variable `number` and assign a value of `5`. - **Line 8:** Initialize a `float` variable `decimal1` and assign a value of `5.87`. - **Line 9:** Initialize a `double` variable `decimal2` and assign a value of `87.0987`. - **Line 10–11:** Initialize a `bool` variable `state1` and `state2` and assign a value `true` and `0`, respectively. Another way to assign value to a bool is to assign `0`/`1` to the variable. But when we print the value of `state1` it prints `1`, not `true`. - **Line 12:** Initialize a `char` variable `letter` and assign a value `A`. - **Line 13:** Initialize a `string` variable `text` and assign a `Welcome to Educative` value. - **Line 15–20:** Displaying the values of variables by prompting a message.

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What are primitive data types in C++?

What is a variable?

Primitive data types

Example

Explanation