compilation problem
 

Hi Linux users

I'm new in Linux. I tried to compile a Fortran program in ubuntu 11.10
with gcc. My fortran program is monte_pi. I saved it in the Desktop. But when I changed directory to /home/nagat/Desktop and run
gcc -o monte_pi monte_pi.f . An error appeared to me
gcc:error:monte_pi: no such file or directory
gcc:fatal error:no input file
compilation terminated
please can any one help me to get over this error?
Thanks in advance

Bests
Nagat

Make sure you are in the correct directory with 'pwd'. Make sure that the file exists with 'ls'. It looks like the compiler cannot find monte_pi.f.

Welcome to LQ. http://www.dartmouth.edu/~rc/classes...simple_ex.html
The file name is monte_pi.f : It's a Fortran program → gcc cannot be used.

Ubuntu 11.10 : 1) sudo apt-get install gfortran
2) gfortran -c monte_pi.f
3) gfortran -o monte_pi monte_pi.o : You get the executable 'monte_pi'.
... Or the simple way (2)(3) : gfortran monte_pi.f -o monte_pi
4) Run the pi test : ./monte_pi

Code:

---

C Program to compute Pi using monte carlo methods

      program monte_pi
      implicit none
     
      integer niter,i,j
      integer seed
      real*4 count
      real *8 x,y,pi(100),z
      real*8  rand
     
C initialize random numbers
      seed = 35791246
      call srand (seed)
      do j= 1,100
          niter = niter+100
          count =0
          do i=1,niter
            x=rand()
            y=rand()
            z= x*x +y*y
            if (z .le. 1) count =count+1
          end do
          pi(j)= count/niter*4.
          write(*,10) niter,pi(j)
10        format('Number of trials is: 'i5,'  estimate of pi is:',f8.5)
      end do
      end

---

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