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Task/GUI-component-interaction/00-TASK.txt

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+Almost every application needs to communicate with the user in some way.
+Therefore, a substantial part of the code deals with the interaction 
+of program logic with GUI components. 
+
+Typically, the following is needed:
+
+* put values into input fields under program control
+* read and check input from the user
+* pop up dialogs to query the user for further information
+
+
+;Task:
+For a minimal "application", write a program that presents a form with three components to the user:
+::* a numeric input field ("Value") 
+::* a button ("increment")
+::* a button ("random")
+
+
+The field is initialized to zero. 
+
+The user may manually enter a new value into the field, 
+or increment its value with the "increment" button. 
+
+Entering a non-numeric value should be either impossible, 
+or issue an error message.
+
+Pressing the "random" button presents a confirmation dialog, 
+and resets the field's value to a random value if the answer is "Yes".
+
+(This task may be regarded as an extension of the task [[Simple windowed application]]).<br><br>
+