Source stepping is only possible when program execution has been halted. Since you halted at the
breakpoint, you can now execute the program line by line using source stepping. Step into the DoLoop
function by selecting the Source-Single Step button on the side toolbar. Step through a few times to
observe the executions. The Step Over and Step Out functions are also available below the Single Step
button. Assembly stepping is also available. Whereas source stepping steps through the lines of code,
assembly stepping steps through the assembly instructions. For more information on assembly stepping,
see Section 5.2.1.