Final answer:
An infinite loop occurs when the condition in a do-while loop structure always evaluates to true, causing the loop to repeat indefinitely.
Step-by-step explanation:
A do-while loop structure is a type of loop that will continue to execute as long as a certain condition is true. An infinite loop occurs when the condition always evaluates to true, causing the loop to repeat indefinitely.
Here is an example of an infinite loop using a do-while loop structure:
do {
// code to be executed
} while (1 == 1);
In this example, the condition (1 == 1) will always be true, resulting in an infinite loop.