add qr code to ssrs report The purpose of the example is to illustrate compound statements and local variable declarations. in Software

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The purpose of the example is to illustrate compound statements and local variable declarations.
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2.6 KEYWORDS
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A keyword in a programming language is a word that is already defined and is reserved for a single special purpose. C++ has 48 keywords. They are:
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We have already seen the keywords char, else, if, int, long, short, signed, and unsigned. The remaining 40 keywords will be described subsequently.
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CONDITIONAL STATEMENTS AND INTEGER TYPES
[CHAP. 2
Keywords like i f and else are found in nearly every programming language. Other keywords such as catch and friend are unique to C++. The 48 keywords of C++ include all 32 of the keywords of the C language. There are two kinds of keywords: those like i f and el se which serve as structure markers used to define the syntax of the language, and those like char and int which are actual names of things in the language. In some languages, the structure markers are called resewed words and the predefined names are called standard identifiers. 2.7 COMPOUND CONDITIONS Conditions such as n % d and x > Y can be combined to form compound conditions. The three logical operators that are used for this purpose are SCGC (and), I I (or), and ! (not). They are defined by &SC p SCGC g evaluates to 1 only when both p and q evaluate to 1 II p I I g evaluates to 1 when either p or q or both evaluate to 1 ! ! p evaluates to 1 when either p evaluates to 0 For example, (n % d I I x > y) willbetrueifeither n % d is nonzero or if x is greater than Y (or both), and ! ( x > Y > is equivalent to x < = Y. The definitions of the three logical operators are usually given by the truth tables below.
P 9 P&&9 P q Plh P 1 !P 0
1 1 1 1 0 0 0 1 0 0 0 0 ~
1 1 1 1 1 0 0 1 1 0 0 0 ~
0 1 +
These show for example, that if p has the value 1 (for true ) and g has the value 0 (for false ), then the expression p 6~6~ g will have the value 0 and the expression p I I q will have the value 1. The next example solves the same problem that Example 2.8 solved, except that it uses compound conditionals:
EXAMPLE 2.10 The Maximum of Three Again
This program uses compound conditions to find the maximum of three integers:
main0 int a, b, c; tout < < "Enter three tin >> a >> b >> c; i f (a >= b && a >= c) if (b >= a ai b >= c) i f (c >= a && c >= b)
integers:
tout << a CC endl; tout << b << endl; tout C-C c << endl; .. . .
CHAP. 21
CONDITIONAL STATEMENTS AND INTEGER TYPES
This simply checks each of the three numbers to see which is greater than or equal to the other two.
Note that Example 2.10 is no improvement over Example 2.8. Its purpose was simply to illustrate the use of compound conditionals. Here is another example using a compound conditional:
EXAMPLE 2.11 User-Friendly Input
This program allows the user to input either a
or a y for yes :
main0 -t char ans; tout << "Are you enrolled (y/n): "; tin >> ans; if (ans == 'Y' I I ans == 'y') tout << "You are enrolled.\n"; else tout << "You are not enrolled.\n"; >
It prompts the user for an answer, suggesting a response of either Y or n. But then it accepts any character and concludes that the user meant no unless either a Y or a Y is input. Compound conditionals that use scsc and I I will not even evaluate the second part of the conditional unless necessary. This is called short-circuiting. As the truth tables show, (p GCSC q> will be false if p is false. So in that case there is no need to evaluate g if p is false. Similarly if p is true then there is no need to evaluate g to determine that (p I I q> is true. The value of short circuiting can be seen from the following example:
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