Programming Loops in C++
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Questions and Answers

What is the primary purpose of a for loop?

  • To skip a block of code
  • To execute a block of code repeatedly for a specified number of iterations (correct)
  • To exit a program
  • To execute a block of code once

What is the syntax for a for loop?

  • for (body; init; cond; incr)
  • for (incr; init; cond) { body }
  • for (cond; init; incr) { body }
  • for (init; cond; incr) { body } (correct)

What does the 'init' part of a for loop do?

  • Initializes the loop variable (correct)
  • Specifies the condition for the loop to continue
  • Specifies the body of the loop
  • Specifies the increment/decrement operation

What is an example of a for loop in C++?

<p>for (int i = 0; i &lt; 5; i++) { cout &lt;&lt; i; } (A)</p> Signup and view all the answers

What happens when the condition in a for loop becomes false?

<p>The loop exits (B)</p> Signup and view all the answers

Study Notes

Types of Loops

  • For Loop: Used to execute a block of code repeatedly for a specified number of iterations.
    • Syntax: for (init; cond; incr) { body }
    • Example: for (int i = 0; i &lt; 5; i++) { cout &lt;&lt; i &lt;&lt; endl; }
  • While Loop: Used to execute a block of code repeatedly while a condition is true.
    • Syntax: while (cond) { body }
    • Example: int i = 0; while (i &lt; 5) { cout &lt;&lt; i &lt;&lt; endl; i++; }
  • Do-While Loop: Used to execute a block of code repeatedly while a condition is true.
    • Syntax: do { body } while (cond);
    • Example: int i = 0; do { cout &lt;&lt; i &lt;&lt; endl; i++; } while (i &lt; 5);

Loop Control Statements

  • Break: Used to exit the loop prematurely.
    • Example: for (int i = 0; i &lt; 5; i++) { if (i == 3) break; cout &lt;&lt; i &lt;&lt; endl; }
  • Continue: Used to skip the current iteration and move to the next one.
    • Example: for (int i = 0; i &lt; 5; i++) { if (i == 3) continue; cout &lt;&lt; i &lt;&lt; endl; }
  • Return: Used to exit the loop and the function.
    • Example: for (int i = 0; i &lt; 5; i++) { if (i == 3) return; cout &lt;&lt; i &lt;&lt; endl; }

Loop Best Practices

  • Use meaningful loop variable names: Use names that indicate the purpose of the loop variable.
  • Avoid complex loop conditions: Keep the loop condition simple and easy to understand.
  • Use loop invariants: Use a consistent variable naming convention throughout the loop.
  • Avoid infinite loops: Make sure the loop has a termination condition to avoid infinite loops.
  • Use loop control statements judiciously: Use break, continue, and return statements sparingly and only when necessary.

Types of Loops

  • For Loop is a type of loop used to execute a block of code repeatedly for a specified number of iterations.
  • For Loop Syntax: for (init; cond; incr) { body }
  • Example of For Loop: for (int i = 0; i &lt; 5; i++) { cout ... }, which initializes a variable i to 0, checks the condition i &lt; 5, increments i by 1, and executes the code within the loop until the condition is met.

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Explore the different types of loops in C++ including for loops, while loops, and do-while loops with examples and syntax.

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