To judge whether the two functions are the same, we can compare them from the following aspects:
1. function name: first, check whether the two function names are consistent. The function name is the identifier of the function. Different names have different functions.
2. Parameter table: compare whether the parameter tables of two functions are the same, including the type, order and number of parameters. If the parameter lists are different, the two functions are different.
3. Return value type: compare whether the return value types of two functions are the same. If the return value types are different, these two functions are different.
4. Function body: Compare the code logic in the function body of two functions in detail, including the definition of variables, conditional judgment, loop, etc. The comparison can be done line by line or block by block. If the function bodies are exactly the same, then the two functions are the same.
Matters needing attention when judging the same function
1. function signature: the name, parameter list and return type of the function constitute the signature of the function. The standard of function identity is the same function signature. Different programming languages may have different requirements for function signature, so make sure that the corresponding parts are consistent.
2. Function semantics: In addition to the function signature, it is also necessary to consider the semantics of the function, that is, whether the behavior and function of the function are the same. The same function should have the same input-output relationship and processing logic.
3. Context Dependence: The implementation of a function may depend on a specific context, such as local variables and global variables. If there are parts in the function implementation that depend on different environments, then even if the function signature and semantics are the same, it cannot be said that the two functions are exactly the same.