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In scientific format, the letter e stands for exponent on 10. So e-14 means 10 14, and thus -5.68434e-14 means 5.68434 10 14 = 0.0000000000000568434. Obviously, the scientific format is more efficient for very small or very large numbers. Floating-point values with magnitude in the range 0.1 to 999,999 will normally be printed in fixed-point format; all others will be printed in scientific format. EXAMPLE 2.17 Scientific Format
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This program shows how floating-point values may be input in scientific format: int main() { // prints double values in scientific e-format: double x; cout << "Enter float: "; cin >> x; cout << "Its reciprocal is: " << 1/x << endl; } Enter float: 234.567e89 Its reciprocal is: 4.26317e-92
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You can use either e or E in the scientific format. 2.14 SCOPE The scope of an identifier is that part of the program where it can be used. For example, variables cannot be used before they are declared, so their scopes begin where they are declared. This is illustrated by the next example. EXAMPLE 2.18 Scope of Variables
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int main() { // illustrates the scope of variables: x = 11; // ERROR: this is not in the scope of x int x; { x = 22; // OK: this is in the scope of x y = 33; // ERROR: this is not in the scope of y int y; x = 44; // OK: this is in the scope of x y = 55; // OK: this is in the scope of y } x = 66; // OK: this is in the scope of x y = 77; // ERROR: this is not in the scope of y } The scope of x extends from the point where it is declared to the end of main(). The scope of y extends from the point where it is declared to the end of the internal block within which it is declared.
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A program may have several objects with the same name as long as their scopes are nested or disjoint. This is illustrated by the next example.
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EXAMPLE 2.19 Nested and Parallel Scopes
int x = 11; // this x is global
int main() { // illustrates the nested and parallel scopes: int x = 22; { // begin scope of internal block int x = 33; cout << "In block inside main(): x = " << x << endl; } // end scope of internal block cout << "In main(): x = " << x << endl; cout << "In main(): ::x = " << ::x << endl; } // end scope of main() In block inside main(): x = 33 In main(): x = 22 In main(): ::x = 11
There are three different objects named x in this program. The x that is initialized with the value 11 is a global variable, so its scope extends throughout the file. The x that is initialized with the value 22 has scope limited to main(). Since this is nested within the scope of the first x, it hides the first x within main(). The x that is initialized with the value 33 has scope limited to the internal block within main(), so it hides both the first and the second x within that block. The last line in the program uses the scope resolution operator :: to access the global x that is otherwise hidden in main().
Review Questions
2.1 2.2 Write a single C++ statement that prints "Too many" if the variable count exceeds 100. What is wrong with the following code: a. cin << count; b. if x < y min = x
else min = y;
What is wrong with this code:
cout << "Enter n: "; cin >> n; if (n < 0) cout << "That is negative. Try again." << endl; cin >> n; else cout << "o.k. n = " << n << endl;
2.4 2.5
What is the difference between a reserved word and a standard identifier What is wrong with this code:
enum Semester {FALL, SPRING, SUMMER}; enum Season {SPRING, SUMMER, FALL, WINTER};
What is wrong with this code:
enum Friends {"Jerry", "Henry", "W.D."};
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