文件名称:Programme
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求面积，数值转换，求出质数，由小到大顺序输出数值，求出字符串长度-the length of the string
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下载文件列表
chiper out area.txt
number interconvert.txt
output prime number.txt
output the number by order.txt
the length of the string.txt
number interconvert.txt
output prime number.txt
output the number by order.txt
the length of the string.txt