How does C language determine the type of constants?

The type of constants in the C programming language can be determined in the following way:

1. Type of integer constants:

1. By default, integer constants are treated as signed integers of type int.
2. If a constant is followed by “L” or “l”, it indicates a long integer type, specifically long.
3. If a constant is followed by “U” or “u”, it indicates an unsigned integer type as unsigned int.
4. If a constant is followed by “UL”, “ul”, “LU” or “lu”, it signifies an unsigned long integer type.

The type of floating-point constants:

1. By default, floating-point constants are treated as double-precision floating point numbers with the type double.
2. If a constant is followed by “F” or “f”, it indicates a single-precision floating point number, with the type as float.
3. If a constant is followed by “L” or “l”, it means long double floating-point, which is of type long double.

3. Types of character constants:

1. Character constants are preceded by single quotes and are of type char.

The type of string constants:

1. String constants are characterized by being preceded by double quotes and being of type char arrays.

It should be noted that in the C programming language, constant types are determined at compile time, not at runtime.