Constant in C++?

Constants are the tokens in C++ that stand in for values that cannot be altered while the program me is running. It has a single definition and stays that way while the program me runs. There are numerous ways to define constants in C++. We will talk about these techniques for defining constants and how they vary from one another in this article.

Syntax

Const data_type Variable_name = Value/Number

Types of Constants/Literals

• Integer Constant

Example

#include <iostream>

using namespace std;

int main() {

    // Integer Constants

    const int x = 10;

    const int y = 15;

    // z is initialized with the value of x + y

    const int z = x + y; 

    // Display

    cout << "Addition: " << z << endl;

    return 0;

}

Output

Addition: 25

•  Floating point Constant

Example

#include <iostream>

using namespace std;

int main() {

    // Floating-Point Constants

    const float x = 7.5;

    const float y = 9.3;

    // z is initialized with the value of x + y

    const float z = x + y; 

    // Display

    cout << "Addition: " << z << endl;

    return 0;

}

Output

Addition: 16.8

• Character type Constant

Example

#include <iostream>

using namespace std;

int main() {

    // Character Type Constant

    const char x = 'S';

    // Display

    cout << "Character: " << x<< endl;

    return 0;

}

Output

Character: S

• String Constant

Example

#include <iostream>

using namespace std;

int main() {

    // String Constants

    const string x = "Ramkrishna";

    // Display

    cout << "String is: " << x << endl;

    return 0;

}

Output

String is: Ramkrishna

• Boolean Constant

Example

#include <iostream>

using namespace std;

int main() {

    // String Constants

    const bool x = true;

    // Display

    cout << "boolean is: " << x << endl;

    return 0;

}

Output

boolean is: 1