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'setprecision'不是'std'的成员

错误:

~> g++ ssstring.cpp
ssstring.cpp: In function ‘int main()’:
ssstring.cpp:12:31: error: ‘setprecision’ is not a member of ‘std’
ssstring.cpp:12:52: error: ‘numeric_limits’ is not a member of ‘std’
ssstring.cpp:12:74: error: expected primary-expression before ‘float’
ssstring.cpp:13:30: error: ‘setprecision’ is not a member of ‘std’
ssstring.cpp:13:51: error: ‘numeric_limits’ is not a member of ‘std’
ssstring.cpp:13:73: error: expected primary-expression before ‘float’
ssstring.cpp:14:28: error: ‘setprecision’ is not a member of ‘std’
ssstring.cpp:14:49: error: ‘numeric_limits’ is not a member of ‘std’
ssstring.cpp:14:71: error: expected primary-expression before …
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c++ string

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