What is the difference between double and float in the C programming language?

In the C language, both double and float are data types used to represent floating point numbers, but they have some differences.

1. The double data type represents double-precision floating-point numbers, occupying 8 bytes (64 bits), providing higher precision and a wider range, allowing for the accurate representation of larger and smaller values. The float data type represents single-precision floating-point numbers, occupying 4 bytes (32 bits), with relatively lower precision and range, suitable for general floating-point operations.
2. When precise calculations and a wider range of values are needed, it is recommended to use double type due to its larger memory requirement and processing time. In situations where there are higher demands on memory and performance, float type can be used to save space and improve calculation efficiency.

Therefore, the decision to use double or float should be based on the specific requirements and calculation precision needed.