test20.txt

思路很清晰的c++课件。例子很简明

#include <iostream.h>
#include <math.h>
void main()
{   int x,y,z;
    double area;
    cin>>x>>y>>z;
    area=Area(x,y,z);
    cout<<"面积为:"<<area<<endl;
}
double Area(int a,int b,int c)
{
    double p,s;
    p=double(a+b+c)/2;
    s=sqrt(p*(p-a)*(p-b)*(p-c));
    return s;
}