By Kenneth S Miller
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Compile and run. Are the values printed what you had expected? Exercise: Slices and User-Defined Types Write a short program that defines two user-defined types, Source and Sink. Include a real variable in each one called value. Declare an array of 50 Source objects, and another with 100 Sink objects. Initialize the value of the Source objects using the random_number intrinsic routine. Copy the values of the Source objects into the first 50 Sink objects. Do all of this without using any explicit loops (ie, use slices and array operations).
The procedures have access to all of the variables declared in the module's data declaration section. As we have already seen, it is good practice to use implicit none to prevent bugs caused by accidentally forgetting to declare variables; by adding an implicit none to the beginning of the module, it automatically applies to all variables and procedures in the module. 36 It is also good practice to enter the save keyword in your modules. This effectively allows the variables declared there to be shared between different parts of a program, such that when a module variable is set to a particular value in one spot, the value can be used from another.
0 * value end function Using this approach, the return variable is declared after the arguments list in the result clause, and its type is declared in the main body of the function. The variable can be assigned as before, and its value will be returned to the caller. 33 Exercise: Square Function Rewrite the subroutine from the previous exercise as a function, which takes a real number as argument, and returns the square of that number. 0 print *, Square(x) print *, x end Compile and run. What do you notice about the value of x, which is the second number printed?