title: Calling a Fortran program within another Fortran program in Fortran 77
body: <p>Say I have two programs: solve.f and plot.f . The solve program solves an equation and prints the data to a file. The plot routine reads that data and plots it. Is there a way that I can call the plot.f file in the solve.f file? </p>
  
  <p>I've tried compiling the plot program (the file was named plot) and tried calling it using "call plot" but that did not work. I looked through the documentation and have not been able to find anything related to this issue. </p>
  
  <p>The only alternative I can think of is to combine the two programs into one.</p>