c++：sqrt

功能：开平方根

头文件：

#include<cmath>

函数声明：

double sqrt (double x);
float sqrt (float x);
long double sqrt (long double x);
double sqrt (T x);           // additional overloads for integral types

例子：

/* sqrt example */
#include <stdio.h>      /* printf */
#include <math.h>       /* sqrt */int main ()
{double param, result;param = 1024.0;result = sqrt (param);printf ("sqrt(%f) = %f\n", param, result );return 0;
}

运行结果：