//编写程序：要求能够通过控制台窗口接收一个整数n，然后在文件"data.txt"中写入所有比n小的素数

//，最后通过控制台窗口分别显示每个数字（0——9）在这些素数中出现的次数。P218-//Write process: requirements through the console window to receive an integer n, then in the file " data.txt"　writes all the prime numbers smaller than n//, respectively, the final adoption of the console window displays each number (0-- 9) In these prime numbers appear more frequently. P218