正确使用while、for、do…while语句实现循环结构，掌握循环条件的设定。

（2）会利用循环嵌套实现较复杂的程序控制，理解循环嵌套程序的执行过程和条件的变化。

（3）利用VC++6.0的调试器跟踪、调试程序，会设置断点、单步跟踪，查看相应的变量或表达式的值，帮助理解循环、选择结构程序执行过程并能查找、修改逻辑错误。

-Proper use of while, for, do ... while statement to achieve circular structure, control loop condition settings. (2) will make use of nested loop process control to achieve more complex, nested loop program execution to understand the process and conditions change. (3) the use of VC++6.0 trace debugger, the debugger will set breakpoints, single-step tracking, view the value of the variable or expression, to help understand the cycle, select the structure of program execution and to find, modify the logic error.