template    valarray pow(const valarray& x,        const valarray& y);template    valarray pow(const  valarray x, const T& y);template    valarray pow(const T& x, const valarray& y);求开方:
template    complex sqrt(const complex& x);#include "stdafx.h"
#include
int main(int argc, char* argv[])
{int na = 2;
int na2 = pow(na,2);
     printf("%d n",na2);float fa = 2.3;
float fa2 = pow(na,2);
   printf("%f n",fa2);float fq2 = 8;
float fq = sqrt(fq2);
    printf("%f n",fq);return 0;
}
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