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（1）录入经济情况
对一个班级的学生的经济情况逐条录入。包括：学号、籍贯、月经济收入、成员数。录入的信息存入文件income.dat或income.txt。
（2）查询学生的经济情况。
允许查询全体学生的，也允许按籍贯查询。
查询家庭人均月收入低于500元的学生的学号籍贯。
查询家庭人均月收入500元以上的学生的学号籍贯。
（3）统计学生的经济情况
统计500元以上的学生数低于500元的学生数和各自所占的比例。
-(1) Input the economic situation on a class of students one by one entry in the economic situation. Include: Student ID, origin, monthly income, the number of members. The information input into the file income.dat or income.txt. (2) query the economic situation of students. Allowed to check all students, and also allows queries by origin. Search family per capita monthly income below 500 yuan origin number of students learning. Search family per capita monthly income of more than 500 students learn number origin. (3) Statistical economic situation of students in statistics the number of students of more than 500 yuan less than 500 the number of students and their respective proportion.
对一个班级的学生的经济情况逐条录入。包括：学号、籍贯、月经济收入、成员数。录入的信息存入文件income.dat或income.txt。
（2）查询学生的经济情况。
允许查询全体学生的，也允许按籍贯查询。
查询家庭人均月收入低于500元的学生的学号籍贯。
查询家庭人均月收入500元以上的学生的学号籍贯。
（3）统计学生的经济情况
统计500元以上的学生数低于500元的学生数和各自所占的比例。
-(1) Input the economic situation on a class of students one by one entry in the economic situation. Include: Student ID, origin, monthly income, the number of members. The information input into the file income.dat or income.txt. (2) query the economic situation of students. Allowed to check all students, and also allows queries by origin. Search family per capita monthly income below 500 yuan origin number of students learning. Search family per capita monthly income of more than 500 students learn number origin. (3) Statistical economic situation of students in statistics the number of students of more than 500 yuan less than 500 the number of students and their respective proportion.
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