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CONDITIONAL STATEMENTS AND INTEGER TYPES
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EXAMPLE 2.6 main0 -t int n, d; tout << "Enter two integers: "; tin >> n x= d; if (n%d) tout << n C-K 'I is not divisible by ' C-C d CC endl; else tout << n << ' is not divisible by ' C-C d << endl;
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2.4 RELATIONAL OPERATORS
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The next example has a condition in a more intuitive form.
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EXAMPLE 2.7 Finding the Maximum of Two Integers
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This program prints the larger of the two numbers input:
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main0 int m, n; tout << "Enter two integers: "; tin >> m >> n; if (m > n) tout C-C m << endl; else tout CC n -CC endl;
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In this program, the condition is (m > n). If m is greater than n, the condition is true and evaluates to 1; otherwise, the condition is false and evaluates to 0. So m is printed precisely when it is greater than n.
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The symbol > is one of the relational operators. It is called relational because it evaluates how the two expressions on either side of it relate; for example, the relation 22 > 5 5 is false. The symbol is called an operator because when it is combined with expressions it produces a value. For example, when > is combined with 2 2 and 5 5 in the form 2 2 > 5 5, it produces the integer value 0, meaning false. There are six relational operators: C is less than c= is less than or equal to II -is equal to > is greater than >= is greater than or equal to != is not equal to
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CONDITIONAL STATEMENTS AND INTEGER TYPES
[CHAP. 2
Note the double equals sign = = must be used to test for equality. A common error among new C++ programmers is to use the single equals sign =. This mistake is difficult to uncover because it does not violate the syntax rules of C++.
EXAMPLE 2.8 Finding the Maximum of Three Integers
This program prints the largest of the three numbers input:
main0 int nl, n2, n3; tout cc "Enter three integers: "; tin >> nl >> n2 >> n3; int max = nl; if (n2 > max) max = n2; if (n3 > max) max = n3; tout cc 'The maximum is H CC max cc endl;
Enter three integers: 77 33 55 : The.xrEiximum- i s -77 . .
On the first run, nl is 22, n2 is 44, and n3 is 66. First max is assigned 22. Then, since 44 is greater than 22, max is assigned 44. Finally, since 66 is greater than 44, max is assigned 66, and that value is printed. On the second run, nl is 77, n2 is 33, and n3 is 55. First max is assigned 77. Then, since 33 is not greater than 77, max is unchanged. Finally, since 55 is also not greater than 77, max is again unchanged, and so the value 77 is printed.
2.5 COMPOUND STATEMENTS A compound statement is a sequence of statements that is treated as a single statement. C++ identifies a compound statement by enclosing its sequence of statements in curly braces. The next example contains the following compound statement:
int temp = x; x = y; Y = temp;
The braces that enclose the three statements form a block. As a compound statement, it itself qualifies as a statement and can be used wherever any other statement could be used. (Note that an entire C++ program-everything that follows main ( > -forms a compound statement.)
CHAP. 21
CONDITIONAL STATEMENTS AND INTEGER TYPES
EXAMPLE 2.9 Sorting This program reads two integers and then outputs them in increasing order:
main0 int x, y; tout cc "Enter two tin >> x >> y; if (x > Y> 1 int temp = x; x = y; Y = temp; tout cc x cc 1
integers:
u << y << endl;
Ent.er two integers: 6 6 $ 4 4 4 66. The effect of putting the compound statement in the i f statement this way is that all three statements inside the block will be executed if the condition is true. These particular three statements form a swap; that is, they interchange the values of x and y. This construct is frequently used in programs that sort data. Such an interchange requires there three separate steps along with the temporary storage location named temp here. Notice that the variable t emp is declared inside the block. That makes it local to the block; i.e., it only exists during the execution of the block. If the condition is false and x 2 y, then temp will never exist. This is a good example of the practice of localizing objects so that they are created only when needed.
This Example 2.9 is not the most efficient way to solve the problem. If all we want to do is print the two numbers in increasing order, we could do it directly without the temp variable:
if (x < y) tout CC x CC ' u << y cc endl; else tout CC y CC ' H -CC x << endl;
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