编写函数double rect-area(double length,double width=0),

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编写函数double rect-area(double length,double width=0),
编写函数double rect-area(double length,double width=0)：当width=0时计算正方形面积,否则计算长方形面积

double rect_area(double length,double width=0){
if(width==0.0) width=length;
return length*width;
}

编写函数double rect-area(double length,double width=0), double Double,double! double double double ** p=new double* 请问double random length of 定义一个函数void f(double a,double b,double& s,double& m)该函数实现将s=a 编写函数 double fun(double x,double y),计算两参数平方差的绝对值,做为函数返回值. 编写计算平均分的函数（函数原型为double average(double score[],int n)） double sum=0 与double sum=0.0 double f(double x); {double a=0;int i; for (i=0;i double x=1.0 double y=5.0 double