Visual Logic Project - 1 • 1. Visual Logic - Project 1 Introduction This project lays the foundation for programming as a problem- solving technique. Basic concepts of input and output are covered, as well as the distinction between logic and syntax of a particular programming language. In this project you will learn that • Variables are storage locations used for holding input and processing information. • Each variable has two components: its name and its value. • Input statements are used to get data into variables.
• Expressions are value-returning code elements. • Assignment statements are used to perform calculations and store the result. • Output statements are used to display information. • Input, assignment, and output statements are sufficient to write small programs. Case Study (Grocery Checkout) This project covers input, processing, and output statements, the minimum functions necessary for a useful computer information system.
Input originalNumber Some professional programmers prefer writing pseudocode to drawing flowcharts, because using pseudocode is more similar to writing the final statements in the programming language. Others prefer drawing flowcharts to represent the logical flow, because flowcharts allow programmers to visualize. Jun 8, 2013 - 2 min - Uploaded by Meri EngelIntro to Programming and Logic: The While Loop - Duration: 8:49. Jeremy Neal 29,906 views.
After discussing these three statements, we will develop a working grocery checkout program. Our solution will input the purchase price of three items in the store. The program will determine the total price of all three items, add 6 percent sales tax, and display the resulting totals.
The solution is presented later in this project. 1-1“Hello World” It is a time-honored tradition that your first program in any language be the output message 'Hello World.” We will follow suit and write a Hello World program using Visual Logic. Begin by running the Visual Logic program contained on with this text. When the program begins, you will see two flowcharting elements, Begin and End, connected by a flow-arrow. Click the left mouse button on the flow- arrow; the Flowchart Elements menu should pop up (Figure 1-1). • Select Output from the popup menu to add an output element to your flowchart.
Then double-click on the newly added output element, opening the output dialog box. Type “Hello World' (make sure that you include the double quotes) in the text box, and then click the OK button. Figure 1-2 shows how your flowchart should look after closing the dialog box. • Press F5 to run the program.
The program executes, generating an output dialog box that appears with the text “Hello World' (Figure 1-3). You have just written your first computer program! 1-2 Logic and Syntax A computer program is a solution to a problem, such as, how can customers view and purchase products over the Internet?” or, “How can sales representatives have immediate and accurate access to inventory data?” Each program (or solution) has two components, its algorithm and its syntax. Descargar La Audacia De La Esperanza Pdf Merge there. An algorithm is the logical design used to accomplish a specific objective.
Various tools for representing computing algorithms are available, the two most common being flowcharts and pseudocode. In this part of the course we will use Visual Logic, which combines the utility of flowcharts (graphical representations of algorithms) and pseudocode (a nontechnical description of an algorithm) with computer simulation. Using Visual Logic, computer algorithms may be written, saved, edited, executed, and debugged. Once an algorithm has been developed, it must be communicated in an appropriate language. To communicate actions to a computer, developers use a programming language like Visual Basic, Cs#, C++, Java, Pascal, or Cobol (among others). Syntax refers to the specific rules of a programming language. There are literally hundreds of programming languages to choose from, each with its own unique syntax.
Therefore, writing a computer program involves creating a logical design to solve a problem and then implementing that design in an appropriate syntax. An information system is a combination of people and technology (computers) that collect, organize and process data to produce information. For any information system to be useful, it must do at least three things: input data into the system, process data within the system, and output resulting information from the system. For example, an online catalog information system might have input that includes the product ID for the items a customer wishes to purchase, along with the customer’s mailing address and credit card number. The processing could include referencing a database to determining the cost of each item, calculating the sales tax, computing the shipping charge based on the customer’s mailing address, and billing the customer’s credit card the appropriate amount.