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Question

a boolean expression that controls the exception of the loob body , what is it? loop continuation condition?

Answer 1

Are you sure about your that statement?
I think, in that statement, It should be "execution" not "exception".

"A boolean expression that controls the execution of the loop body".
That is a exit condition, otherwise it becomes Infinite loop.

Edit:
There you can specify that in varies ways...
For ex: for loop
for(initializations ; exit_condition ; increment/decrement)
{
//body..
}
for(int i=0; i<10; i++)
{
..
}
Here, i<10 is the boolean condition, which stops loop when i value becomes 10.