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Testing Strategies

  Testing Strategies 1. Importance of Testing Strategies    - Ensures correctness, completeness, and quality of software    - Identifies errors, gaps, and missing requirements    - Helps in reducing and removing errors to improve software quality    - Verifies if software meets specified requirements 2. Testing Techniques and Approaches    - Component-level testing to integration testing    - Different techniques suitable at different stages of testing    - Incremental testing approach for better effectiveness    - Involvement of both developers and independent test groups 3. Distinction between Testing and Debugging    - Testing focuses on finding errors and verifying requirements    - Debugging is the process of identifying and fixing errors    - Both activities are important but serve different purposes Topic: Benefits of Software Testing 1. Cost-Effectiveness    - Identifying bugs early saves money in the long run    - Fixing issues in the early stages is less expensive 2. Security
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Postfix Expression Evaluation

 

Postfix Expression Evaluation

A postfix expression is a collection of operators and operands in which the operator is placed after the operands. That means, in a postfix expression the operator follows the operands.

Postfix Expression has following general structure...

Operand1 Operand2 Operator

Example

postfix expression evaluation

Postfix Expression Evaluation using Stack Data Structure

A postfix expression can be evaluated using the Stack data structure. To evaluate a postfix expression using Stack data structure we can use the following steps...

  1. Read all the symbols one by one from left to right in the given Postfix Expression
  2. If the reading symbol is operand, then push it on to the Stack.
  3. If the reading symbol is operator (+ , - , * , / etc.,), then perform TWO pop operations and store the two popped oparands in two different variables (operand1 and operand2). Then perform reading symbol operation using operand1 and operand2 and push result back on to the Stack.
  4. Finally! perform a pop operation and display the popped value as final result.

Example

Consider the following Expression...

Postfix Expression Evaluation

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