Dear.
I have to do a REXX program to calculate how many days left until the next anniversary of the mainframe (April 7, 1964). When you run the program in REXX, it should show the current date and ask the User that between the number of days per week to be considered useful (eg if I take note that Saturday and Sunday are not working days, would come with 5 . If you consider Sunday as not only useful, would come with 6). Display an error message if the number of working days is less than 1 or greater than 7. After the performance, display the total number of days missing, according to the number of days you took a week. I do not have much knowledge in REXX, but if you can help, I thank you.