equivalence, fortran
时间: 2023-07-02 17:09:57 浏览: 58
Equivalence is a feature in Fortran that allows two or more variables to share the same memory location. This means that changes made to one variable will affect the other variables that are declared as being equivalent to it.
For example, consider the following Fortran code:
```
INTEGER :: x, y
REAL :: z
EQUIVALENCE (x, z)
EQUIVALENCE (y, z)
```
In this code, both `x` and `y` are declared as being equivalent to `z`. This means that any changes made to `z` will also affect `x` and `y`. Similarly, any changes made to `x` or `y` will also affect `z`.
It is important to use equivalence with caution, as it can lead to unexpected behavior if not used correctly. It should only be used when necessary and with a clear understanding of its implications.