Question

C++初学者，求教~谢谢各位大神~用海伦公式计算三角形面积的编程

#include <iostream.h>
void main()
{
double a;
double b;
double c;
double p;
cout<<"please input a number as one of the lines"<<endl;
cin>>a;
cout<<"please input another one"<<endl;
cin>>b;
cout<<"the last one is required to be larger than "<<b-a<<" smaller than "<<a+b<<endl;
cin>>c;
p=0.5*(a+b+c);
res=p*(p-a)*(p-b)*(p-c);
cout<<"square is "<<res<<endl;
}
运行结果如图……在线等……

Answer 1

#include <iostream.h>
#include <math.h> //使用根号函数要用这个头文件
void main()
{
double a;
double b;
double c;
double p;
cout<<"please input a number as one of the lines"<<endl;
cin>>a;
cout<<"please input another one"<<endl;
cin>>b;
cout<<"the last one is required to be larger than "<<b-a<<" smaller than "<<a+b<<endl;
cin>>c;
p=0.5*(a+b+c);
double res=sqrt(p*(p-a)*(p-b)*(p-c)); //注意,要开根号的...
cout<<"square is "<<res<<endl;
}

追问

结果还是不行啊……

追答

用我的代码应该是没问题的,我运行过了

追问

我直接复制的您的代码……它总是出现3.7097e+blblbl的

Answer 2

你输入的时候，在整数后面加个小数点试试，比如"1.0"

Answer 3

不会