1.Integer If it is determined that an integer is not a negative number, you should use unsigned int instead of int. Some processors deal with unsigned integers much more efficiently than signed integers (this is a good practice and also helps the self-explanation of specific types of code). Therefore, in a tight loop, the best way to declare an int integer variable is to register an unsigned variable _ name. Remember, the operation speed of plastic IN is high, and it is directly completed by the processor without the help of FPU or floating-point operation library. Although this does not guarantee that compilers will definitely use registers to store variables or that processors can handle unsigned integers more efficiently, it is universal for all compilers. For example, if the result of a calculation package needs to be accurate to two decimal places, we can multiply it by 100, and then convert it into a floating-point number as late as possible.

Code is a source file written by programmers in the language supported by development tools. It is a set of clear rules, and information is represented in discrete form by characters, symbols or signal elements.

The principles of code design include uniqueness, standardization and universality, expansibility and stability, easy identification and memory, short and unified format and easy modification. Source code is a branch of code. In a sense, source code is equivalent to code. In modern programming languages, source code can appear in the form of books or tapes, but the most commonly used format is text files. The purpose of this typical format is to compile computer programs. The ultimate goal of computer source code is to translate human-readable text into computer-executable binary instructions. This process is called compilation and is completed by the compiler.