Coding the Program:
Translating the algorithm into specific program language instructions is called coding. An appropriate programming language should be chosen and the program should be created by typing in the code. Programmers must follow the language's rules (syntax) carefully. These rules specify how certain operations should be expressed to arrive at appropriate results. It should also be kept in mind that a particular language suits a particular program. For example, C language is most widely used for writing system software; COBOL is mostly used for writing business programs.
Testing and Debugging the Program:
The process of testing and debugging is undertaken to ensure that there are no obvious errors in the program. Testing and debugging of programs is done to detect and eliminate syntactical and logical errors in the program code. Program testing tools can check for errors in the syntax while the program is being written.
The program will be executable once the syntactical errors have been eliminated. However, the output may still not be error free, as the language-testing tool cannot detect logic errors. A logic error is a mistake that the programmer makes while developing the program. For example, while writing a program to calculate the net pay, if the programmer writes add deductions to gross pay (instead of subtract deductions from gross pay), the computer cannot detect the error. To find and correct logic errors, therefore, the programmer has to carefully examine the program output. Errors, both syntactical and logical, are popularly called bugs, and the process of eliminating these errors is called debugging.
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