What is the main function of a while loop?

The main function of a while loop is to iterate as long as a boolean expression is true. This means that the while loop continually executes a block of code repeatedly until the specified condition evaluates to false. The while loop checks the condition at the beginning of each iteration, allowing it to adapt dynamically based on the condition's truth value.

For instance, if the condition involves a variable that changes during each iteration (such as a counter), the loop will stop executing once that variable satisfies the false condition. This is especially useful in scenarios where the number of iterations isn't known beforehand, such as reading data from a file until the end of the file is reached or processing user input until a specific termination command is issued.

The other options describe different behaviors that do not accurately represent the core functionality of a while loop. Uniform execution of statements pertains more to other control structures rather than being unique to a while loop. Similarly, repeating based on a predefined set of conditions can apply to other constructs, such as for loops, which may not iteratively check a condition at each cycle like a while loop does. Executing a statement only once does not capture the essence of what a while loop does, as that describes the behavior of a control structure in which no repetition is involved