Could anyone please explain this codes ?

inmenu=sprintf(' enter the number of the desired filter type:\n1) Low-pass \n2) High pass\n3) Band-pass \n4) Band-stop\n-> ');
 filtertype=0;
 while(filtertype==0)
      filtertype=input(inmenu);
      if(isempty(filtertype))
          fitertype=0;
      end
      if ((filtertype<1) || (filtertype>4))
                    filtertype=0;
      end
 end
switch (filtertype)
           case 1,
                            ----
          case 2,
                         -----
         case 3,
                       ------
        case 4,
                    ---
     end

finally required output commands

[Walter Roberson]

you would be better off using menu() instead of input()

[SUKUMAR NAGINENI]

Thank you so much for your suggestion. But, I want to know the brief explaination of the above code, could anyone please explain the code.

[dpb]

What [don't you understand, specifically after reading the documentation for input, switch and while? What happens if you just put the line

disp(filtertype)

after each of the case statements? Does that not give you a clue along with what the input prompt says?

Failing that, set a breakpoint in the editor at the while line and then step through with the debugger trying various input values and see how it works...

[Image Analyst]

I think he wants us to replace the ---- with actual working code that does the different filtering operations.

[SUKUMAR NAGINENI]

Thank you for your suggestions. I want to know how the while loop is works with sprintf (inmenu) function.

[Walter Roberson]

sprintf is just constructing aa constant string with built in newline characters . input() passed aa string displays the string and accepts user input . The code tests to see if the user input is in range and uses switch if it is .

If the user enters a value such as 2.75 then the code will exit the loop because the checking is not good enough .

[SUKUMAR NAGINENI]

Thank you, I got it.