Im trying to write a program in fortran 90 to process some output files that i have. Here is the problem I am having. All of the output files are named file.datA, file.datB,...ect. I set the variable "file" to equal file.dat. I want the program to run through a loop and each time change the name of "file". Basically I need to add A-Z on the end each time it reads the file.