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The first command in this example runs Yacc on the first prerequisite of whichever rule uses the canned sequence. The output file from Yacc is always named y.tab.c. The second command moves the output to the rule’s target file name. To use the canned sequence, substitute the variable into the recipe of a rule. You can substitute it like any other variable (see Basics of Variable References). Because variables defined by define are recursively expanded variables, all the variable references you wrote inside the define are expanded now. This is a realistic example, but this particular one is not needed in practice because make has an implicit rule to figure out these commands based on the file names involved (see Using Implicit Rules). In recipe execution, each line of a canned sequence is treated just as if the line appeared on its own in the rule, preceded by a tab. In particular, make invokes a separate sub-shell for each line. ’) on each line of a canned sequence.
The value to give the variable appears on the following lines. The end of the value is marked by a line containing just the word endef. Aside from this difference in syntax, define works just like any other variable definition. The variable name may contain function and variable references, which are expanded when the directive is read to find the actual variable name to use. The final newline before the endef is not included in the value; if you want your value to contain a trailing newline you must include a blank line. You may omit the variable assignment operator if you prefer. ’ and creates a recursively-expanded variable (see The Two Flavors of Variables). ’ operator, the value is appended to the previous value as with any other append operation: with a single space separating the old and new values. You may nest define directives: make will keep track of nested directives and report an error if they are not all properly closed with endef.
It’s a universal phenomenon, and one of the most common things we do. We laugh many times a day, for many different reasons. Most people are surprised to hear that not even 20 per cent of laughing is a response to humour. Most of the time it’s a message we send to other people, a way of communicating joyful disposition, a willingness to bond and so on. So it plays a very important role in social interaction. Interestingly, laughter differs between the sexes, particularly the uses to which the sexes put laughter as a social tool. For instance, women smile more than laugh, and are particularly good at smiling and laughing as a kind of ‘social lubricant’, to create a relaxed mood. In most cultures, loud, raucous laughter with exaggerated movements and expressions is considered ‘unfeminine’, and is much more common among men, particularly if they’re with other men. Men are more likely to use laughter as a way of asserting power — for example, socially dominant individuals, from bosses to tribal chiefs, use laughter to control their subordinates.
They are idle until the user takes an action upon a control. When you add a Click event handler to a Button, the event handler method will be invoked when the user clicks on the button. Note: Windows Forms provides some automatic features that will turn an Enter keypress into a Click event in some cases. In the Visual Studio properties window, a lightning bolt signifies the event handlers list. You can click on it and then double-click on an event. Any statements can be used. Instead of double-clicking to create a new event handler for one control event, you can use the drop-down box to select a method that already exists to handle the events. There are restrictions: the method signature must be compatible. Tip: Wiring multiple events to one event handler is useful. It can simplify the source code of medium-complexity programs. We see the body of the Click event that can be added to handle click events for the button1 control instance.
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