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Section: Flow Control
The break statement is used to exit a loop prematurely. It can be used inside a for loop or a while loop. The syntax for its use is 
break
 inside the body of the loop. The break statement forces execution to exit the loop immediately. 
Here is a simple example of how break exits the loop. We have a loop that sums integers from 1 to 10, but that stops prematurely at 5 using a break. We will use a while loop.
break_ex.m
function accum = break_ex
  accum = 0;
  i = 1;
  while (i<=10)
    accum = accum + i;
    if (i == 5)
      break;
    end
    i = i + 1;
  end
The function is exercised here:
--> break_ex ans = 15 --> sum(1:5) ans = 15