std_math_sqrt.md

#功能 计算参数x的平方根。 #原型 #include<math.h>
double sqrt(double x) #实例

#include <stdio.h>
#include <math.h>

int main ()
{

   printf("Square root of %lf is %lf\n", 4.0, sqrt(4.0) );
   printf("Square root of %lf is %lf\n", 5.0, sqrt(5.0) );

   return(0);
}

输出结果为：

Square root of 4.000000 is 2.000000
Square root of 5.000000 is 2.236068

#备注 很简单，没啥补充的。