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8.6.3 CHWCHK2 and CMP/CMP2 Instructions The 68020 check instruction (CHK) compares a 32-bit two s-complement integer value residing in a data register (Dn) against a lower bound (LB) value of zero and against an upper bound (UB) value of the programmer s choice. The upper bound value is located at the effective address (EA) specified in the instruction format. The CHK instruction has the following format: CHK.S (EA),Dn where the operand size (.S) designates word (.W) or long word (.L). If the data register value is less than zero (Dn < 0) or if the data register is greater than the upper bound (Dn > UB), the processor traps through exception vector 6 (offset $1 8) in the exception vector table. Of course, the operating system or the programmer must define a check service handler routine at this vector address. The condition codes after execution of the CHK are affected as follows: If Dn < 0, then N = 1; if Dn > UB (upper bound), then N = 0. If 0 I I then N is undefined. X is unaffected and all other flags Dn UB are undefined and program execution continues with the next instruction. The CHK instruction can be used to maintain array subscripts because all subscripts can be checked against an upper bound (i.e., UB = array size - 1). If the subscript compared is within the array bounds (i.e., 0 I subscript value I value), the subscript is valid and UB the program continues normal instruction execution. If the subscript value is out of array limits (i.e., 0 > subscript value or subscript value > UB value), the processor traps through the CHK exception. The purpose of the CHK instruction is to provide boundary checking by testing if the content of a data register is in the range from zero to an upper limit. The upper limit used in the instruction can be set equal to the length of the array. Then, every time the array is accessed, the CHK instruction can be executed to make sure that the array bounds have not been violated. The CHK instruction is usually placed after the computation of an index value to ensure that the index value is not violated. This permits a check of whether or not the address of an array being accessed is within array boundaries when address register indirect with index mode is used to access an array element. For example, the following instruction sequence permits accessing of an array with base address in A0 and an array
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FIGURE 42-2 Use the Toolbox to add new tasks to your maintenance plan.
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For more information on adding the Windows Forms namespace so that you can use Windows Forms in Blend, see 23.
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In addition to exporting an HTML table, query, or form datasheet, you can import or link to an HTML table directly. This process uses the standard Import or Linked Table Wizard shown and used in 22.
When we were looking to send e-mail we had to get ourselves a mail Session object to the transport layer we wanted to communicate with, in this instance an SMTP server. This object would have the hostname/ip address and might even include some authentication to gain the right to relay e-mail. We don t wish to hardcode any of this information into our WAR/EAR files. This is the sort of information that will only be available when the system is in production and may even be liable to change. Therefore, it is better if we keep this information out and let the administrator configure it. Naturally we can use configuration files and what have you. But a much more elegant approach is possible; we can use the Java Naming Directory Interface (JNDI).
34 Working with Access Projects
66 The Old Art of Macroeconomics
Blend nests the image into a paragraph when it is between two paragraphs. Simply copy and paste the paragraph to where you want the image to be in the flow document. For example, the following code places the image as the first element in the rich text box. The Design view is shown on the right in Figure 9.10.
3.5.1 Fat-Soluble Vitamins
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SB,P (t, z, d ,P ) = d 0max (d0 , d ) g (t, z, d )P (t, z, d ) d0 g (t, z, d )P (t, z, d )
Ch. 8 Information Privacy and Security Issues
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Consider the situation (Fig. 10.4) where a beam of projectile nuclei of intensity f0 particles/second is incident upon a thin foil of target nuclei with the result that the beam is attenuated by reactions in the foil such that the transmitted intensity is f particles/second. We can ask what fraction of the incident particles disappear from the beam, that is, react, in passing through the foil. Let us assume the beam intersects an area A on the foil. We can then assert that the fraction of beam particles that is blocked (reacts) is the fraction of the area A that is covered by target nuclei. If the foil contains N atoms/cm2, then the area a that is covered by nuclei is N (atoms/ cm2) a (cm2) (the effective area subtended by one atom) (cm2/atom). This latter term, the effective area subtended by one atom, is called the cross section, s, for the reaction under study. Then the fraction of the area A that is blocked is a/A or N (atoms/cm2) s (cm2/atom). If we say the number of projectile nuclei absorbed per unit time is Df, then we have Df fNs As an aside, we note the units of N are atoms/cm2 or thickness, Dx (cm) density n (atoms/cm3). Expressing the above equation as a differential equation, we have df fNs Thus, upon rearranging, we have df Ns ns dx f ftrans x df ns dx 0 finitial f ln ftrans nsx finitial ftrans finitial e nsx
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