用write!和writeln!即可。
write!(&mut writer, "Factorial of {} = {}", num, factorial);writeln!就是在最后自动加一个换行。
原文：https://stackoverflow.com/questions/32472495/how-do-i-write-a-formatted-string-to-a-file
用write!和writeln!即可。
writeln!就是在最后自动加一个换行。
原文：https://stackoverflow.com/questions/32472495/how-do-i-write-a-formatted-string-to-a-file
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