Compile and Link Source Code (translate to machine language)

Compile means use a compiler (program) to translate the text source code into code that the machine can understand.

Commonly available FORTRAN compilers in UNIX are:

1. g77
2. g90
3. gfortran

Commonly available FORTRAN compilers in Windows are:

1. VisualFortran

Programs, functions, and subroutines must all be compiled before they can be run by a computer.