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