Answer / Pratibha Yadav

In C++, a constant is a variable whose value cannot be changed during the execution of the program. It is also known as a literal.nnThere are four types of constants in C++:n1) Integer Constants: Examples include 42, 0xFF (hexadecimal), and 3'000'000 (cube notation).n2) Floating-Point Constants: Examples include 3.14159 (decimal), 6e-7f (exponential notation for floating-point numbers), and 0xf0p-2 (binary floating-point number with mantissa and exponent parts).n3) Character Constants: A character constant is enclosed in single quotes, like 'a' or 't'.n4) String Literals: A string literal is a sequence of characters enclosed in double quotes, like "Hello, World!".nnA const variable can be declared by adding the keyword const before its type. For example, `const int my_constant = 42;`

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