What are real constants in the C language?

Real constants in the C language refer to constants used in a program to represent real numbers. Real constants can be floating point numbers composed of an integer part, a decimal part, and an exponent part, or they can be real numbers with an exponent part of 0. Examples of real constants include 3.14, -2.5, 1.0, and 6.02e23.

In C, real constants default to the double type. If you need to represent a float type real number, you can add an F or f suffix after the constant, for example, 3.14F represents a float type real number. Additionally, real constants can also be expressed in scientific notation, for example, 6.02e23 represents 6.02 times 10 to the power of 23.