# Does anyone know how to program with Fortan 95?

• Fortran
• kathrynag
In summary, Kathryn is trying to program for her midterm in Fortran 95, but she is having some errors. She is also having trouble with the syntax of the language. She is having some problems with the exponentiation operator, and the read statement before end program should be write. She is also having trouble with the file extension.
kathrynag
Fortran 95!

Does anyone know how to program with Fortan 95? I need some help!

Something specific:
I'm trying to write a program in Fortan 95. I need to find the distance between 2 points (x1,y1) and (x2,y2) on a Cartesian coordinate plane given by the equation:
d=sqrt[(x1-x2)^2+(y1-y2)^2].
I want to use the points (-1,1) and (6,2).

This is the copy of what I am doing:
program distance
!kathryn, Assignment 2-21, calculate distance between two points.
implicit none
real::x1 !This is the x from the first ordered pair.
real::y1 !This is the y from the first ordered pair.
real::x2 !This is the x from the second ordered pair.
real::y2 !This is the y from the second ordered pair.
real:: d !This is the distance we are trying to find.
write(*,*) 'This program calculates the distance between two points
+ on a Cartesian coordinate plane.'
d=sqrt((x1-x2)^2+(y1-y2)^2) !Calculation
read(*,*) 'The distance between any two points ,'(x1,y1)', and ,'(x2,y2)', is ,'d
end

My problem is that when I compile, I get errors. Where am I going wrong?

I don't know f90 but what are the error messages ?

mgb_phys said:
I don't know f90 but what are the error messages ?

i don't know right off hand, but it's f95.

kathrynag said:
i don't know right off hand, but it's f95.
Theres no real difference, between Fortran90 and Fortran95,
The compiler error should at least tell you which line the problem is on.

Is ^ a new operator in f95 It used to be '**' in f77 ?

Ok, well I could try it again. I can't run it on my comp. I'll have to try a different one.

I think there are two bugs:

(1) The exponentiation operator is (**) in F95, not (^)

Useful nucleus said:
I think there are two bugs:

(1) The exponentiation operator is (**) in F95, not (^)

Ok, I'll try those, but I still got errors. Is the last read statement fine other than the write?

Hi kathrynag

It looks like that there are some synatax errors and a logical one actually.

(1) In your code you wrote

Code:
write(*,*) 'This program calculates the distance between two points
+ on a Cartesian coordinate plane.'

The continuation operator in Fortran is "&" not "+", so a valid statement is
Code:
write(*,*) 'This program calculates the distance between two points &
& on a Cartesian coordinate plane.'

(2) A logical error in this statement:

Code:
read(*,*) d

You are supposed to ask the user to enter the coordinates x1,x2,y1,y2 , not the distance . After all your code should calculate the distance when the user enters the coordinates. So a valid statement should be

Code:
read(*,*) x1, y1, x2,y2

(3) This statement has some syntax erros:
Code:
read(*,*) 'The distance between any two points ,'(x1,y1)', and ,'(x2,y2)', is ,'d

A better one is :
Code:
write(*,*)'The distance between any two points ,',x1,y1,', and ,',x2,y2,', is ,',d

Compare them.

(4) Finally, if you are using fixed format file, make sure that none of the lines is longer than 80 columns. If any is longer, use the continuation operator "&"

Hope that works for you

Ok, I'll try those and let you know what happens.
should I do read(*,*) x1,x2,y1,y2 or separate lines for each variable?

kathrynag said:
Ok, I'll try those and let you know what happens.
should I do read(*,*) x1,x2,y1,y2 or separate lines for each variable?

It is fine as you wrote it.

I got it all figured out except for the extension of a line. It works fine if I don't extend a line.

## 1. What is Fortran 95?

Fortran 95 is a programming language commonly used for scientific and numerical computing. It is an updated version of the original Fortran language and includes modern features such as object-oriented programming and improved array handling.

## 2. Is Fortran 95 still relevant today?

Yes, Fortran 95 is still widely used in scientific and engineering fields, particularly for high-performance computing and numerical simulations. It is also still actively maintained and updated by its developers.

## 3. Do I need any special software to program with Fortran 95?

Yes, you will need a Fortran 95 compiler to write and run programs in this language. Some popular options include GNU Fortran (gfortran), Intel Fortran Compiler, and PGI Fortran.

## 4. How difficult is it to learn Fortran 95?

Learning any new programming language can be challenging, but Fortran 95 is known for its simple syntax and straightforward structure. If you have experience with other programming languages, you may find it easier to pick up Fortran 95.

## 5. Where can I find resources to learn Fortran 95?

There are many online resources available for learning Fortran 95, including tutorials, videos, and documentation from the language's official website. You can also find books and courses that specifically focus on teaching Fortran 95.

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