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Looping (for, while, do-while)

Loops in C are essential control structures that enable the repetition of a block of code until a specific condition is met. They come in three main types: for, while, and do-while. Let’s dive into each loop type and understand their syntax and usage in C programming.

The For Loop

The for loop in C is widely used when the number of iterations is known beforehand. Its syntax comprises three essential components: initialization, condition, and increment/decrement.

for (initialization; condition; increment/decrement) {
// Code block to be executed
}

Here, the initialization initializes the loop control variable, the condition checks the looping condition, and the increment/decrement modifies the loop control variable in each iteration.

The While Loop

The while loop is suitable when the number of iterations is not known beforehand and is based on a condition. It keeps executing the code block as long as the condition remains true.

while (condition) {
// Code block to be executed
}

The while loop checks the condition before entering the loop, and if the condition is false initially, the code block is not executed.

The Do-While Loop

Similar to the while loop, the do-while loop also executes a block of code repeatedly based on a condition. However, it checks the condition after executing the code block, ensuring that the block executes at least once.

do {
// Code block to be executed
} while (condition);

The do-while loop guarantees the execution of the code block once before verifying the condition for further iterations.

Best Practices and Use Cases

  • For Loop: Ideal for iterating through arrays and known ranges of values where the number of iterations is predetermined.
  • While Loop: Suitable for scenarios where the loop’s termination depends on a condition evaluated before the loop begins.
  • Do-While Loop: Helpful when you need to execute a block of code at least once, regardless of the condition.

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