Program Development Cylce

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2. Program Development Cycle
● Define the problem
○ Careful reading of the problem.
○ We are not focusing on solution part here.
● Analyze the problem
○ Determine all possible solutions and select the
best from them.
○ We can break whole problem into sub problems.
● Design the solution
○ Create an outline on how the program should
execute.
○ Expand it into steps (algorithm) which describe
the order of tasks to be carried out.
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3. Program Development Cycle (Cont)
● Code the program
○ Begins only after we have clear idea about
algorithm of solution.
○ We can use appropriate language and editor to
write the code.
● Compilation of code
○ Find the syntax and semantic errors.
○ Compiler or Interpreters of corresponding
language can be used.
○ If error occurs, we need to change the code to
solve errors.
○ After successful compilation, object code is
generated that a machine can understand.
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4. Program Development Cycle (Cont)
● Linking of object code
○ Linker links the libraries and object code then
puts all objects into correct order in the
executable.
○ If error occurs during linking, it might be a
problem in writing code of linking.
● Loading of program
○ Loader loads the program into main memory
and control is passed to processor.
○ Loading includes reading an executable,
checking permission, initializing registers.
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5. Program Development Cycle (Cont)
● Program execution and testing
○ Execution of program is done by processor.
○ Debugger can be used to trace the error.
○ We verify the output. If the desired output is not
achieved, we need to revice the whole process.
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6. Program Development Cycle
Problem
Analysis
Algorithm Design
Coding
Error
Library Compilation
Error
Linking
Loading
Error
Execution
Results
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