6th Class Computers Science Basics of Computer Introducing Computer Programming

Introducing Computer Programming

Category : 6th Class

Introducing Computer Programming

Computer programs are set of instructions that enable a computer to interact with the user, peripherals and information. These instructions are written in a language called computer programming language. The process of writing computer programs is called computer programming. While writing a program using a computer programming language, such as C, you need to follow the syntax of that language. A programming language also provides operators that enable you to perform various tasks, such as computing and manipulating values of variables, compare values of different variables of same data types and test multiple conditions.

Developing Flowchart

Flowchart is a technique that allows you to represent computer program graphically. Using flowchart you can easily understand the logic of a program. A flowchart represents the logical and operational steps to be performed within the system for transforming the input process into output. Flowchart serves as a basis for discussion and communication between the system analysts and the programmers.

To create a flowchart, you need to use the following symbols

Start and Stop symbol
Processing symbol
Flow Line symbol
Input / Output symbol
Decision making symbol

SYMBOL	DESCRIPTION
	This symbol is used to represent the start and the end of an algorithm or process.
	This symbol is used to represent the logic used in a process or algorithm.
	This symbol is used to represent the input/output steps of a process.
	This symbol is used to represent the conditional situation of a process.
	This symbol is used to represent the flow of control in a process.

While creating a flow chart you need to keep the following points in your mind

While creating a flow chart only a single flow line comes out from a process symbol.
Flow direction of a process will always indicate either from left to right or from top to bottom.
In decision box only one flow line enters and multiple flow lines can come out.
Only a single flow line comes out from starting process and enters single flow line in stop process.
Every flowchart contains a logical start and a logical end.

The following figure displays the flowchart of a program for printing grade of employ according to his or her salary: (See Figure 6.1.4)

Using flowchart you can grip logic of algorithm easily. Which one of the following symbol is used to represent conditional situation of a process in flowchart?