4. Other comments include the input by form and type, output by form and type, data structures used, main function and other functions used, and assumptions.

5. The purpose of every function and their inter-relationships must be described with comments.

6. Comments are to be inserted in the program wherever necessary for clarity. The purpose of such comments is not to tell how or why something is done, but what is being done.

Question - 22 : -
Explain program maintenance with reference to organization.

Answer - 22 : -

Program maintenance is an important duty of programmers. It involves all steps from problem definition to program preparation. In certain organizations, programmers can do nothing but maintain the programs.

At the initial stage of computerization, an organization’s programming effort mostly goes into the development of new applications. As the number of installed programs grows, the programming effort shifts from program development to program maintenance, in fact, in many organizations, more than half of the programming effort is on program maintenance. An estimate shows that the cost of program maintenance is twice larger than that of initial development.

Question - 23 : -
Explain run time error with example.

Answer - 23 : -

Run-Time Errors : A program’s syntax may be correct- H may be compiled and linked successfully. But it may not be executed successfully because of run-time errors. Such errors are found at the time of executing the program.

Let us consider the following program segment

n = 9;

while (n > 1)

{

n-1

m = m / (n -1);

}

When the value of n becomes 2, the expression a > 1 is true.

Hence, the statement n – decreases the value of n by 1. When the value of n is 1, Ihe divisor is O’ which generates a run-time error. Run-time errors include finding square root of a negative number, stack overflow, and null pointer assignment.

Question - 24 : -
Explain logical error.

Answer - 24 : -

A logic error is a defect in the program that causes it to produce an incorrect result, but one that is not so blatant as to be detectable as a runtime error. (A logic error in one part of the program might eventually trigger a runtime error in some other part of the program, but those are separate errors.) An example would be a function that is supposed to return the larger of its two arguments but in fact returns the smaller:

def larger(m, n):

if (m > n):

return n

return m

Question - 25 : - Write all steps of program solving methodology.

Answer - 25 : -

There are following seven steps of program solving methodology:

1. Problem Definition: Computer programs are written to solve problems posed by humankind. Prior to writing a program, one has to understand a description of the problem to solve. This description may be very precise or vague, but nevertheless, it is necessary /present. Once programmer is sure of what the problem entails, he must write down a list of specifications. Specifications are precise definitons of what the program must do.

2. Problem Analysis: In this step, the problem has to be fragmented into smaller and manageble parts. The original problem has to be analyzed and divided into a number of sub-problems as these sub-problems are easier to solve and their solutions would become the components of the final problem. Each sub-problem is divided into further smaller ones and this fragmentation has to be continued to achieve simple solutions. The use of modular programming is to get proper solution.

3. Designing the Problem : Designing the problem can be expressed in the form of:

(i) Algorithm

(ii) Flowchart

(i) Algorithm: An algorithm is a set of instructions that describe a method for solving a problem. It is normally given in mixture of computer code and English Language. This is often called “Pseudocode”.

(ii) Flowchart : The algorithm is represented in the form of a diagram with action boxes linked by lines showing the order in which they are executed. This is known as ‘the flow of control’. It is the diagrammatic representation of an algorithm.

4. Coding : The process of translating the algorithm into syntax of a given language is known as ‘coding’. Since algorithm cannot be executed directly by the computer, it has to be translated into a programming language.

5. Program Testing and Debugging : Program testing means running the program, executing all its instructions and testing the logic by entering sample data in order to check the output. Debugging is the process of finding and correcting the errors in the program code.

6. Documentation : The documentation includes the problem definition, design documents, a description of the test perform, a history of the program development and its different versions and a user’s manual. Such a manual is designed for a native user and illustrates the preparation of input data, running the program and obtaining and interpreting the results.

7. Program Maintenance : It is not directly part of the original implementation process, but needs special emphasis. All activities that occur after a program operation are part of the program maintenance. Many large programs have long life span that often exceed the lifetime of the hardware they run on. Maintenance is an important part of the life cycle of a program.

Question - 26 : -
What is run-time error, logical error and syntax error?

Answer - 26 : -

Syntax error : The errors which are traced by the compiler during compilation, due to wrong grammar for the language used in the program, are called syntax errors.

For example, cin<

Run time Error : The errors encountered during execution of the program, due to unexpected input or output are called run-time error.

For example – a=n/0; // division by zero

Logical Error : These errors are encountered when the program does not give the desired output, due to wrong logic of the program.

For example : remainder = a+b// instead of using % operator + operator is used.

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