ssrs 2016 barcode Enter class year: 1 Freshman in Software

Creation QR Code ISO/IEC18004 in Software Enter class year: 1 Freshman

Enter class year: 1 Freshman
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Enter class year: -9 *** not in school.
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The year is tested through a cascade of conditionals, continuing until one is found true, or until the last else is reached as in the third run.
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The Conditional Expression Operator C++ provides an abbreviated form of a special case of the if ... else statement. It is called the conditional expression operator and uses the and then : symbols in a special ternary format: condition expression1 : expression2 Like any operator, this combines the given expressions to produce a value. The value produced is either the value of expression1 or that of expression2, according to whether the condition is true or false. For example, the assignment statement min = x<l>y x : y; will assign the value of x to min if x<l>y, otherwise it assigns the value of y to min. The conditional expression operator is generally used only when the condition and both expressions are very simple. The switch Statement The sequence of mutually exclusive alternatives delineated by the multiple else if construct often can also be coded using a switch statement. Its syntax is switch (expression) { case constant1: statementList1; case constant2: statementList2; : case constantN: statementListN; default: statementList; }
The switch statement evaluates the expression and then looks for its value among the case constants. If the value is found among the constants listed, then control is transferred to the first statement in that statementList. Otherwise if there is a default (which is optional), then the program branches to that statementList. Note that the expression must evaluate to an integer type and that the constants must be integer constants (which include chars).
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Example 2.11
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The program has the same effect as the program in Ex. 2.10: int yr; cout <<"Enter class year: "; cin >>yr; switch (yr<0 0 : yr) { case 0: cout <<" *** not in school."; case 1: cout <<" Freshman"; case 2: cout <<" Sophomore"; case 3: cout <<" Junior"; case 4: cout <<" Senior"; default: cout <<" *** career student."; }
break; break; break; break; break;
First the program changes negative years to 0 (yr<0 0:yr) Then that value is located in the case list, and every statement from there to the next break is executed. If the breaks were not included every case after the matching one would be executed. 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. Also 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. Example 2.12 Nested and Parallel Scopes int x = 11; // this x is global int main() { // begin scope of main( int x = 22; { // begin scope of internal block int x = 33, y=44; cout <<"In inside block: x =" <<x <<endl; } // end scope of internal block cout <<"In main(): x = " <<x <<endl; cout <<"In main(): : :x = " <<::x <<endl; return 0; } // end scope of main()
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In inside block: x = 33 In main(): x = 22 In main(): :: x = 11
The variable y is only available in the inside block. 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 to 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 to 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(). Enumeration Types In addition to the predefined types such as int and char, C++ allows you to define your own data types. This can be done in several ways, the most powerful of which use classes as described in s 8-11. We consider here a much simpler kind of user-defined type. An enumeration type is a user-defined integral type with the syntax: enum typename { enumeratorlist ); Here enum is a C++ keyword, typename stands for an identifier that names the type being defined, and enumeratorlist stands for a list of identifiers that define integer constants. For example, the following defines the enumeration type Semester, specifying three possible values that a variable of that type can have: enum Semester {fall, spring, summer}; We can then declare variables of this type: Semester s1, s2; and can use them as we would predefined types: s1 = spring; s2 = fall; if (s1==s2) cout <<"Same semester. \n"; The actual values defined in the enumeratorlist are called enumerators. In fact, they are ordinary integer values. The values fall, spring, and summer defined for the Semester type above could have been defined like this: const int fall=O, winter=1, summer=2;
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