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Modify the program in Example 2.10 by replacing the second i f with an e 1 se i f and the third i f with an else. How does this improve the efficiency of the program On the average, how many conditions will be tested per run Write and run a program that reads three integers and prints the minimum and maximum. Use the conditional expression operator. Modify Problem 2.18 so that it is more user-friendly. Use a char instead of an int for input, allowing the user to type in either r , p , or s for rock, paper, or scissors. .

Fig. 15-33

2.1 2.2 if (count > 100) tout << "Too many";

15.10 Constructing similar triangles Construct a triangle similar to triangle ABC in Fig. 15-34, with a base twice as long as the base of the given triangle.

A reserved word is a keyword in a programming language that serves to mark the structure of a statement. For example, the keywords i f and el se are reserved words. A standard identifer is a keyword that defines a type. Among the 48 keywords in C++, if, e 1 s e, and whi 1 e are reserved words, and char, int, and float are standard identifiers. The term short-circuiting is used to describe the way C++ evaluates compound logical expressions like ( x > 2 I I y > 5 ) and ( x > 2 &SC y > 5 ) . If x is greater than 2 in the first expression, then y will not even be evaluated. If x is less than or equal to 2 in the second expression, then y will not even be evaluated. In these cases only the first part of the compound expression is evaluated because that value alone determines the truth value of the compound expression. This expression evaluates to - 1 if x < y, it evaluates to 0 if x = = y, and it evaluates to 1 if x > y. A fall through in a switch statement is a case that does not include a break causing control to continue right on to the next case statement. statement, thereby b

12 20

Fig. 15-34

2.4 2.5 2.6

Fig. 15-35

! q; for example, if p is true and q is false, the first a. ! (p I I q) isnot the same as !p I I expression will be false but the second expression will be true. The correct equivalent to the expression ! (p I I q) is the expression ! p &SC ! q. b. ! ! ! p is the same as ! p. c. p && 4 I I r is not the same as p SC& ( q I I r ) ; for example, if p is false and r is true, the first expression wzbe true, but the second expression will be false: p && q I I r & the same as (p &SC q) I I r. The second enum definition attempts to redefine the constants spring, summer, and f al 1.

Construct ArCr twice as long as AC, and then use construction 23. Alternative method (Fig. 15-35): Extend two sides of ^ABC to twice their lengths and join the endpoints.

2.7 2.8 2.9

Enumerators must be valid identifiers. String literals like I Tom " a n d " Dick " are not identifiers. The programmer probably intended to test the condition (x = = 0 ) . But by using assignment operator instead of the equality operator = = the result will be radically different from what was intended. For example, if x has the value 22 prior to the i f statement, then the i f statement will change the value of x to 0. Moreover, the assignment expression (x = 0 ) will be evaluated to 0 which means false, so the e 1 se part of the conditional will execute, reporting that x is not zero!

a 15.1. Given line segments with lengths a and b as follows: equals (a) a b; (b) a b; (c) 2a b; (d) a 3b; (e) 2(a a 15.2. Given line segments with lengths a, b, and c: length equals (a) a b c; (b) a c b; (c) a 2(b b . Construct a line segment whose length b); (f) 2(3b a). (15.1) c 2(a . Construct a line segment whose c); (e) 3(b c a). (15.1) B; (b) A B; (15.2)

66 97 l

15.3. Given angles with measures A and B (Fig. 15-36). Construct an angle with measure (a) A (c) 2B A; (d) 2A B; (e) 2(A B).

w = Log(v) p = q * Exp( q * t)