In addition to scientific notation, e is also a very common mathematical constant in C language, which represents the base of natural logarithm. Natural logarithm is widely used in mathematics, so it is often used in C language. For example, in computer science, many algorithms need to use natural logarithm, and e is the most important constant in this application.
In addition, e is also used to indicate some special events or errors in the program. Taking C language as an example, the program may encounter the error of dividing by zero when it is running. At this time, C language will return a special E value, indicating that an error has occurred; In addition, e can also be used to indicate the end of the file, indicating that the program has read the last bit of the file at this time. Therefore, e is not only a number or mathematical constant in C language, but also has rich semantics and significance.