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birt ean 128,
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birt ean 128,
birt ean 128,
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This statement causes the value 237 to be placed in the memory allocated for myInt. In this line of code, myInt is known as an l-value ( l-value stands for left-value ), because it appears on the left side of the = operator. A variable makes a fine l-value. A number (like 237) makes a terrible l-value. Why Because values are copied from the right side to the left side of the = operator. In this line of code

237 = myInt;

Keyboards are plentiful and common, and a new basic keyboard is very inexpensive Even with cheap keyboards, users tend to get attached to these devices over time and in the case of an expensive keyboard with lots of extra buttons and features, the user may have both a nancial and an emotional attachment! For these reasons, it s important that you learn to play Dr Keyboard, xing these devices when they break

you are asking the compiler to copy the value in myInt to the number 237. Since you can t change the value of a number, the compiler will report an error when it encounters this line of code (most likely, the error message will say something about an invalid lvalue in assignment ). Go ahead; try this yourself.

As we just illustrated, you can use numerical constants (such as 237) directly in your code. In the programming world, these constants are called literals.

How is it possible to design a memory hierarchy that reasonably approximates the infinite capacity and bandwidth, low latency, persistence, and low cost specified by the five memory idealisms If one were to assume a truly random pattern of accesses to a vast storage space, the task would appear hopeless: the excessive cost of fast storage technologies prohibits large memory capacity, while the long latency and low bandwidth of affordable technologies violates the performance requirements for such a system Fortunately, an empirically observed attribute of program execution called locality of reference provides an opportunity for designing the memory hierarchy in a manner that satisfies these seemingly contradictory requirements Locality of reference describes the propensity of computer programs to access the same or nearby memory locations frequently and repeatedly Specifically, we can break locality of reference down into two dimensions: temporal locality and spatial locality Both types of locality are common in both the instruction and data reference streams and have been empirically observed in both user-level application programs, shared library code, as well as operating system kernel code Temporal locality refers to accesses to the same memory location that occur close together in time; many real application programs exhibit this tendency for both program text or instruction references, as well as data references Figure 33(a) annotates an example sequence of memory references with arrows representing temporal locality; each arrow connects an earlier and later memory reference to the same address Temporal locality in the instruction reference stream can be easily explained, since it is caused by loops in program execution As each iteration of a loop is executed, the instructions forming the body of the loop are fetched again

At the end of this lab, you ll be able to Repair stuck keyboard keys Dismantle and clean a keyboard

Look at this example:

#include <stdio.h> int main (int argc, const char * argv[]) { int myInt, anotherInt; myInt = 503; anotherInt = myInt; return 0; }

Notice that we ve declared two variables in this program. One way to declare multiple variables is the way we did here, separating the variables by a comma (,). There s no limit to the number of variables you can declare using this method. We could have declared these variables using two separate declaration lines:

Lab Exercise 1201: Paging Dr Keyboard! 205

int int myInt; anotherInt;

.

Either way is fine. As you ll see, C is an extremely flexible language. Let s look at some other operators.

The materials you need for this lab are A Windows system As many throw-away keyboards as possible (functional keyboards that you won t mind throwing away at the end of this lab; the connection type is unimportant as long as they re usable by a Windows system) A medium-sized athead screwdriver Compressed air A lint-free cloth

The addition (+) and subtraction (-) operators each take two values and reduce them to a single value. An operator that operates on two values is said to be a binary operator. An operator that operates on one value is said to be a unary operator. A value operated on by an operator is said to be an operand. For example, this statement

myInt = 5 + 3;