fortran parameter什么意思

在Fortran中，PARAMETER是一种特殊的声明，用于将常量定义为程序中的一个符号名称。这样，以后在程序中使用该符号时，实际上使用的是该常量的值。这是一种方便的方式，可以避免在程序中多次使用相同的数字或文本值时出错。

例如，下面的代码段定义了一个名为"pi"的常量，并将其值设置为3.141592653589793。在程序中使用"pi"时，实际上使用的是该常量的值，即3.141592653589793。

REAL, PARAMETER :: pi = 3.141592653589793

需要注意的是，PARAMETER声明只能用于常量，不能用于变量。这意味着一旦常量被声明为PARAMETER，它的值就不能在程序中更改。

相关问题

Fortran parameter

In Fortran, a parameter is a named constant that is assigned a value that cannot be changed during the execution of the program. It is declared using the `parameter` keyword followed by the name of the constant and its value.

For example, consider the following code:

program example
  implicit none
  integer, parameter :: n = 10
  real, parameter :: pi = 3.14159
  print *, "The value of n is:", n
  print *, "The value of pi is:", pi
end program example

In this code, we have declared two parameters `n` and `pi`. The value of `n` is set to 10 and the value of `pi` is set to 3.14159. These values cannot be changed during the execution of the program.

When we run the program, it will print the following output:

The value of n is:           10
The value of pi is:   3.14159012    

Note that parameters are often used to define physical or mathematical constants that are used throughout the program. They can also be used to simplify the code and make it more readable by replacing hard-coded values with named constants.

fortran parameter

In Fortran, a parameter is a named constant that is assigned a value that cannot be changed during the execution of the program. It is declared using the `parameter` keyword followed by the name of the constant and its value.

For example, consider the following code:

program example
  implicit none
  integer, parameter :: n = 10
  real, parameter :: pi = 3.14159
  print *, "The value of n is:", n
  print *, "The value of pi is:", pi
end program example

In this code, we have declared two parameters `n` and `pi`. The value of `n` is set to 10 and the value of `pi` is set to 3.14159. These values cannot be changed during the execution of the program.

When we run the program, it will print the following output:

The value of n is:           10
The value of pi is:   3.14159012    

Note that parameters are often used to define physical or mathematical constants that are used throughout the program. They can also be used to simplify the code and make it more readable by replacing hard-coded values with named constants.