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printf()和coutC++有什么区别？

我有一个float值列表,我想cout用2位小数打印它们.

例如:

10.900  should be printed as 10.90
1.000 should be printed as 1.00
122.345 should be printed as 122.34

我怎样才能做到这一点？

(setprecision似乎没有帮助.)