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## C++ continue Statement In C++, the `continue` statement is a loop control statement that works somewhat like the `break` statement. However, instead of forcing the loop to terminate entirely, `continue` skips the remaining code inside the current iteration and forces the loop to begin its next iteration. ### How it Behaves Across Different Loops: * **`for` Loop:** Encountering `continue` causes the program to immediately jump to the update/increment expression (e.g., `i++`), and then evaluate the conditional test. * **`while` and `do...while` Loops:** Encountering `continue` causes the program control to jump directly to the conditional test to determine if the loop should run again. --- ## Syntax The syntax for the `continue` statement in C++ is straightforward: ```cpp continue; ``` ### How `continue` Works in Loop Structures ``` +---------------------------------------+ | | v | ---> (True) ---> | | | (False) (continue statement hit) | | v v ``` --- ## Flowchart ``` +---------------+ | Start Loop | +-------+-------+ | v /-----------------\ / Is Condition \ No < Satisfied? > ------> \ / \-----------------/ | Yes v | v /-----------------\ / Is continue \ Yes < encountered? > --------+ \ / | | No | v | | | | | +<------------------+ | v ``` --- ## Code Examples ### Example 1: Using `continue` in a `do...while` Loop In this example, we initialize a local variable `a` with a value of 10. We use a `do...while` loop to print the value of `a`. When `a` equals 15, we increment its value and trigger the `continue` statement to skip the print statement for that specific iteration. ```cpp #include using namespace std; int main () { // Local variable declaration int a = 10; // do...while loop execution do { if( a == 15) { // Skip the rest of this iteration a = a + 1; continue; } cout << "Value of a: " << a << endl; a = a + 1; } while( a < 20 ); return 0; } ``` #### Output When the above code is compiled and executed, it produces the following output (notice that `15` is skipped): ```text Value of a: 10 Value of a: 11 Value of a: 12 Value of a: 13 Value of a: 14 Value of a: 16 Value of a: 17 Value of a: 18 Value of a: 19 ``` --- ### Example 2: Using `continue` in a `for` Loop The `continue` statement is highly effective in `for` loops for filtering out unwanted iterations. In this example, we print only the even numbers between 1 and 10. ```cpp #include using namespace std; int main() { for (int i = 1; i <= 10; i++) { // If i is odd, skip the print statement and go to the next iteration if (i % 2 != 0) { continue; } cout << i << " is an even number." << endl; } return 0; } ``` #### Output ```text 2 is an even number. 4 is an even number. 6 is an even number. 8 is an even number. 10 is an even number. ``` --- ## Key Considerations and Best Practices 1. **Avoid Infinite Loops in `while` / `do...while`:** When using `continue` inside a `while` or `do...while` loop, ensure that the loop control variable is updated *before* the `continue` statement is executed (as shown in Example 1). Otherwise, you may create an infinite loop because the update step is skipped. 2. **Readability vs. Nested Conditions:** The `continue` statement is excellent for implementing the "guard clause" pattern. It helps keep your code clean by avoiding deeply nested `if-else` blocks inside loops. 3. **Scope Limitation:** The `continue` statement only affects the innermost loop in which it is placed. If you have nested loops, a `continue` statement inside the inner loop will not skip iterations of the outer loop.