Computer Q&A for K12 (+2) - Part V
1. What is a loop/Iteration?
- A loop/Iteration is a set of lines executed repeatedly.
- A loop essentially consists a condition.
- A loop runs till the condition is true, stops when it becomes false
Example:
- while - entry check loop
- Do…while - exit check loop
- for loop
2. What are functions? (or) Define Functions.
- Functions are the building blocks of c++ programs.
- Functions means writing a part of a program separately under a different name.
- The main purpose of writing functions is reusability of code
- Functions always end with paranthesis, i.e, ()
- Functions has to be
- Declared
- Defined and
- Invoked
3. What are the advantages of functions?
- Increases Modularity.
- Reusability of code.
- Easy to test & Debug.
- Transferable across programs.
4. Describe about call by value & call by reference?
- Call by reference when parameters are passed to a function it is passed either as call by value or as call by reference.
- In call by value the actual parameters are copied to formal parameter,
- So changes in the called function will not be seen in calling function.
- In call by reference an alias name is given to actual parameters ,so
- Changes in called function seen in calling function.
We must add & (amperesand) before formal parameters in call-by-reference.
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