可以具体点不？不是很明白啊～

Question

int main(){complex< double> m=(5,1);cout <<m;return 0;} 我输出的值为什么就只是 <1,0>对了， 还有就是 pair 类型的输出，比如， 如何一起输出这两个值pair< string, string > author( "James", "Joyce" );

Answer 1

因为你多写了一个 “=”，去掉就对了。 
输出pair只能重载<<操作符。

Answer 2

complex<double>
The explicitly specialized template class describes an object that stores an ordered pair of objects both of type double, first representing the real part of a complex number and the second representing the imaginary part.
第一个改下：
complex< double> m(5,1.02);
cout <<m.imag()<<endl;
cout <<m.real();

pair< string, string > author( "James", "Joyce" );
cout<<author.first<<endl;
cout<<author.second<<endl;