C++课程设计，小学四则运算器，能随机生成十以内的四则运算，并判断用户的正确性，统计正确率和平均做题时间，并输出相应的评语。-C++ Curriculum design, four primary computing device, can be randomly generated within the 10 four operations, and to judge the correctness of users, statistical accuracy rate and average time to do questions and output the corresponding reviews.