In C language, EPS is a common abbreviation in code, which stands for "Epsilon". Epsilon is a Greek letter, which represents a very small value in mathematics, that is, a value close to zero but not zero. In C language, EPS is often used to represent the minimum difference between two floating-point numbers, that is, machine precision.

The significance of EPS is that it is very useful for comparing floating-point numbers. Because floating-point numbers are stored in binary rather than decimal, there are some accuracy problems. Therefore, when judging whether two floating-point numbers are equal, we need to use EPS to judge whether they are equal, and use the minimum difference of EPS to judge whether they are equal.

It should be noted that different machines and different compilers may have different EPS values. Therefore, when comparing floating-point numbers, you need to choose the value of EPS according to the specific situation. At the same time, because EPS is a very small value, it is not appropriate to use EPS for the four operations of floating-point numbers, because it will introduce a large error, which will affect the correctness of the calculation results.