In C++, a string constant also called a string literal is a fixed sequence of characters enclosed in double quotes (" "). For example: "This is a string" and it is used to read-only memory, and its value cannot be changed during the program. Defining C++ Strings ConstantsYou can define your own named string constants by using: String Literals The const keyword The #define preprocessor directive The constexpr keyword(in modern C++) Let us understand each type of String Constant in C++ by ... Read More

A string literal or anonymous string is a type of literal in programming for the representation of a string value within the source code. More simply put, a string literal is a bit of text between double quotes. For example,const char* var = "Hello";In this definition of var, "Hello" is a string literal. Using const in this way means you can use var to access the string but not to change it. A C++ compiler handles it in the same way as it would handle a character array.

Character constants are one or more members of the “source character set, ” the character set in which a program is written, surrounded by single quotation marks ('). They are used to represent characters in the “execution character set, ” the character set on the machine where the program executes. These are sometimes also called character literals.In C++, A character literal is composed of a constant character. It is represented by the character surrounded by single quotation marks. There are two kinds of character literals − Narrow-character literals of type char, for example, 'a' Wide-character literals of type wchar_t, for example, L'a'The ... Read More

Floating-point constants specify values that must have a fractional part.Floating-point constants have a "mantissa, " which specifies the value of the number, an "exponent, " which specifies the magnitude of the number, and an optional suffix that specifies the constant's type(double or float).The mantissa is specified as a sequence of digits followed by a period, followed by an optional sequence of digits representing the fractional part of the number. For example −24.25 12.00These values can also contain exponents. For example, 24.25e3 which is equivalent to 24250In C++ you can use the following code to create a floating point constant −ExampleLive ... Read More

Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.In C++ you can use the following code to create an integer constant −#include using namespace std; int main() {    const int x = 15; // 15 is decimal integer constant while x is a constant int.    int y = 015; // 15 is octal integer constant while y is an int.    return 0; }You can ... Read More

A literal is a value that is expressed as itself. For example, the number 25 or the string "Hello World" are both literals.A constant is a data type that substitutes a literal. Constants are used when a specific, unchanging value is used various times during the program. For example, if you have a constant named PI that you'll be using at various places in your program to find the area, circumference, etc of a circle, this is a constant as you'll be reusing its value. But when you'll be declaring it as −const float PI = 3.141;The 3.141 is a ... Read More

A literal is any notation for representing a value within the source code. They just exist in your source code and do not have any reference a value in memory. Contrast this with identifiers, which refer to a value in memory.There are several types of literals in C++. Some of the examples of literals are −"Hello" (a string)3.141 (a float/double)true (a boolean)3 (an integer)'c' (a character)Things that are not literals −bar = 0; (a statement)3*5-4 (an expression)std::cin (an identifier)

Variable and constant are two commonly used mathematical concepts. Simply put, a variable is a value that is changing or that have the ability to change. A constant is a value which remains unchanged.For example, if you have a program that has a list of 10 radii and you want to calculate the area for all of these circles. To find the area of these circles, you'll write a program that will have a variable that will store the value of PI and this value will not change throughout the program. Such values can be declared as a constant.In the ... Read More

There are no types of constants in C++. It's just that you can declare any data type in C++ to be a constant. If a variable is declared as constant using the const keyword, you cannot reassign its value. Example#include using namespace std; int main() {    const int i = 5;    // Now all of these operations are illegal and    // will cause an error:    i = 10;    i *= 2;    i++;    i--;    //...    return 0; }

You can define constants in C++ by adding the const qualifier before the declaration of the variable. Example#include using namespace std; int main() {    const int x = 9;    x = 0;    return 0; }This will define the constant variable x. But it will throw an error as we are trying to rewrite the value of a constant.