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x= 1e+30 x= inf x= -inf x= inf We use two variables of type float int main() { // converts inches to centimeters: float inches, cm; cout << "Enter length in inches: "; cin >> inches; cm = 2.54*inches; cout << inches << " inches = " << cm << " centimeters.\n"; } Enter length in inches: 16.9 16.9 inches = 42.926 centimeters.
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The programs in the first two chapters all have sequential execution: each statement in the program executes once, and they are executed in the same order that they are listed. This chapter shows how to use selection statements for more flexible programs. It also describes the various integral types that are available in C++. 3.1 THE if STATEMENT The if statement allows conditional execution. Its syntax is
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where condition is an integral expression and statement is any executable statement. The statement will be executed only if the value of the integral expression is nonzero. Notice the required parentheses around the condition. EXAMPLE 3.1 Testing for Divisibility
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This program tests if one positive integer is not divisible by another: int main() { int n, d; cout << "Enter two positive integers: "; cin >> n >> d; if (n%d) cout << n << " is not divisible by " << d << endl; } On the first run, we enter 66 and 7: Enter two positive integers: 66 7 66 is not divisible by 7 The value 66%7 is computed to be 3. Since that integral value is not zero, the expression is interpreted as a true condition and consequently the divisibility message is printed. On the second run, we enter 56 and 7: Enter two positive integers: 56 7 The value 56%7 is computed to be 0, which is interpreted to mean false, so the divisibility message is not printed.
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In C++, whenever an integral expression is used as a condition, the value 0 means false and all other values mean true. The program in Example 3.1 is inadequate because it provides no affirmative information when n is divisible by d. That fault can be remedied with an if..else statement. 3.2 THE if..else STATEMENT The if..else statement causes one of two alternative statements to execute depending upon whether the condition is true. Its syntax is 36
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if (condition) statement1; else statement2; where condition is an integral expression and statement1 and statement2 are executable statements. If the value of the condition is nonzero then statement1 will execute; otherwise statement2 will execute.
EXAMPLE 3.2 Testing for Divisibility Again
This program is the same as the program in Example 3.1 except that the if statement has been replaced by an if..else statement: int main() { int n, d; cout << "Enter two positive integers: "; cin >> n >> d; if (n%d) cout << n << " is not divisible by " << d << endl; else cout << n << " is divisible by " << d << endl; } Now when we enter 56 and 7, we get an affirmative response: Enter two positive integers: 56 7 56 is divisible by 7 Since 56%7 is zero, the expression is interpreted as being a false condition and consequently the statement after the else is executed.
Note that the if..else is only one statement, even though it requires two semicolons. 3.3 KEYWORDS A keyword in a programming language is a word that is already defined and is reserved for a unique purpose in programs written in that language. Standard C++ now has 74 keywords:
and bitor char continue dynamic_cast extern goto mutable operator public signed switch try union wchar_t and_eq bool class default else dfalse if namespace or register sizeof template typedef unsigned while asm break compl delete enum float inline new or_eq static this typeid virtual xor auto case const do explicit for int not private static_cast throw typename void xor_eq bitand catch const_cast double export friend long not_eq protected short struct true using volatile
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