编写一个程序，在屏幕上出现一个圆心沿正弦曲线轨迹移动的实心圆，要求每隔4分之一周期，圆的填充色和圆的周边颜色都发生变化（颜色自己选取），同时圆的半径在四分之一周期内由正弦曲线幅值的0.2倍至0.6倍的线性增长。-The preparation of a procedure on the screen there is a center of a circle along the sinusoid trajectory mobile solid round, one request every 4

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Fundamentals of Global Positioning System Receivers: A Software Approach-While GPS receivers abound in numerous applications, much of the information on their design is scattered in disparate and hard-to-find places. This new work provides engineers

总结了一些c++编程中的代码重用技巧。可以借鉴学习，同时长时间的规范自己的编程格式、养成良好高效的编程习惯-Summarizes some c++ programming code reuse techniques. You can learn from, while long regulate their programming format, to develop good programming habits efficient