vb.net barcode reader tutorial IMPORTANT PROGRAMMING CONCEPTS in Software

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13.1 IMPORTANT PROGRAMMING CONCEPTS
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Bytes in Memory Variable Name 0 1 2 3 4 5 6 7 8 9 10 Index Values
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FIGURE 13-3 The memory usage of an array variable consisting of single bytes. Note that this type of array could be a string.
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Depending on the programming language, you may be able to access a string like a single element variable or as an array of characters. The BASIC language handles strings as a single element variable, which means you can read and write to them without any special functions or operators. The C language requires the programmer to treat strings of characters as an array and each array element must be handled separately. To simplify the amount of work required to deal with strings in C, there are a number of standard library routines written for it, but new programmers will find working with strings in C challenging.
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13.1.6 DECISION STRUCTURES
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If you are familiar with programming, when you skim over this section you might think that decision structures is a fancy euphemism for if and other conditional execution statements. That would be an unfortunate conclusion because it simplifies the different structures and what can be done with them. Decision structures are the basis of structured programming and were invented to simplify the task of programming and reading code. The decision structures all avoid the use of the goto statement. This is important because gotos can make code difficult to read and more difficult to write. The issue is that gotos have to have somewhere to go to either an address, line number, or label. Using only decision structures in your programming avoids this requirement and allows you to concentrate on the program instead of trying to remember if you have used a label before. Even though decision structures and structured programming are considered advanced programming topics, by using them your programs will actually be more simple to create. The first decision structure to be aware of is the if statement, which is often written out in the form if/else/endif because these are the three statements that make up the decision structure that executes if a set of conditions is true. If a specific number of statements are to execute if the conditions are true, the statements
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if (Condition) Statement1 Statement2 : endif
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are used. The condition statement is normally in the form:
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Variable|Constant Operator Variable|Constant
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PROGRAMMING FUNDAMENTALS
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where the Operator can be one of the six comparison operators listed in Table 13-5. The vertical bar (|) is an OR and indicates that either a variable or a constant can be placed at this part of the condition. Note that the equals and not equals operators can be different depending on the programming language used. The values on the left and right side of the comparison operator can also be arithmetic expressions (i.e., i + 4 ), but when you first start programming, you should avoid making the comparisons complex as it will make it more difficult for you to debug later. Multiple comparisons can be put together in a comparison statement using the logical AND and OR operators available in the programming language. Like adding arithmetic expressions to comparisons, you should avoid putting in multiple comparisons in a single statement until you are comfortable with programming. An optional part of the if decision structure, the else statement, can be used to specify statements that execute when the conditions are not true:
if (Condition) Statement1 Statement2 : else Statement1 Statement2 : endif
Along with executing some statements if conditions are true, you can also repeatedly execute instructions while a condition is true using the while statement in which the condition is exactly the same as the if statement. When the endwhile statement is encountered, execution jumps back up to the original while statement and re-evaluates the condition. If it is true, the statements inside while and endwhile repeat, else the statements after the endwhile execute.
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