Fortran parameter
时间: 2023-10-04 22:09:37 浏览: 23
In Fortran, a parameter is a variable whose value cannot be changed during the execution of the program. It is declared using the PARAMETER keyword followed by the variable name and its value, like this:
```
INTEGER, PARAMETER :: n = 10
```
In this example, the variable n is declared as an integer parameter with a value of 10. Once defined, the value of the parameter cannot be changed in the program. Parameters are often used to define constants or to set the size of arrays.
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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关键字
Fortran中的参数(parameter)关键字用于声明常量。它可以用于不同的场景,例如:
1. 在程序中定义一个常量:
```
program example
implicit none
integer, parameter :: N = 10 !定义常量N为10
integer :: i
do i = 1,N
print *,i
end do
end program
```
2. 在子程序中定义一个常量:
```
subroutine example()
implicit none
integer, parameter :: N = 10 !定义常量N为10
integer :: i
do i = 1,N
print *,i
end do
end subroutine
```
在上述例子中,N是一个常量,在程序或子程序的运行过程中不可改变。如果试图改变N的值,编译器将会报错。