Homework Help Forum: college

Posted by timi on Sunday, November 1, 2009 at 6:14pm.

What will the following pseudocode program display? Module main( ) Declare Integer x = 1 Declare Real y = 3.4 Display x, " ", y Call changeUs(x, y) Display x, " ", y End Module Module changeUs(Integer a, Real b) { Set a = 0 Set b = 0 Display a, " ", b }

• Programming/math, not "college" - Writeacher, Sunday, November 1, 2009 at 6:49pm

  Assistance needed. Please type your subject in the School Subject box. Any other words are likely to delay responses from a teacher who knows that subject well.

  
  

• college - Quidditch, Sunday, November 1, 2009 at 7:10pm

  For the pseudocode you need to know if variables passed to the module are passed by reference or passed by value. It is likely that they are passed by value. Look at all your display statements. Think what each will show. The "Display" function probably adds end of line stuff. Otherwise, all display would be on one line. The first one is: 1 3.4

  
  

• college - MathMate, Sunday, November 1, 2009 at 7:20pm

  To do this kind of exercise, it is best to make a table of values of each of the variables. Proceed to execute the program and make changes to the variables requested by the code. I will make a start: x y a b code - - - - Module main( ) 1 - - - Declare Integer x = 1 1 3.4 - - Declare Real y = 3.4 *************** **** 1 3.4 **** Display x, " ", y *************** 1 3.4 - - Call changeUs(x, y) 1 3.4 1 3.4 Module changeUs(Integer a, Real b) 1 3.4 0 3.4 Set a = 0 1 3.4 0 0 Set b = 0 ************* **** ? ? **** Display a, " ", b ************* ************* **** ? ? **** Display x, " ", y ************* End Module Can you take it from here?

  
  

• college - MathMate, Sunday, November 1, 2009 at 7:24pm

  As Quidditch correctly mentioned, it is necessary to know if the module ChangeUs() passes the parameters by value, i.e. make a copy, or by reference, i.e. give the address of the variables, so that any change inside of ChangeUs will affect the value of the variable in the calling module.

  
  

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