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#2
rjsp2013-08-17 15:41
你贴的代码中根本就没有 'class CLine ('，你还是将代码贴完整些。
对于你已有的代码，当如下修改  程序代码：#include <cmath> #include <iostream> class CLine { public: explicit CLine( float X1=0.0f, float Y1=0.0f, float X2=0.0f, float Y2=0.0f ) : x1_(X1), y1_(Y1), x2_(X2), y2_(Y2) { } float length() const { return sqrt( (x1_-x2_)*(x1_-x2_) + (y1_-y2_)*(y1_-y2_) ); } private: float x1_, y1_; float x2_, y2_; friend std::ostream& operator<<( std::ostream& os, const CLine& line ); }; std::ostream& operator<<( std::ostream& os, const CLine& line ) { return os<<"[("<<line.x1_<<','<<line.y1_<<"),("<<line.x2_<<','<<line.y2_<<")]"; } using namespace std; int main() { CLine line( 0.0f, 0.0f, 4.0f, 3.0f ); cout << line << " length is " << line.length() << endl; return 0; } |
部分代码：
class CLine
{
public:
CLine(){}
CLine(float X1=0,X2=0,Y1=0,Y2=0)
{
x1=X1; x2=X2; y1=Y1; y2=Y2;
}
void Length()
{
int k;
k= sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<k<<endl;
}
void show()
{
cout<<'('<<x1<<','<<y1<<')'<<endl;
cout<<'('<<x2<<','<<y2<<')'<<endl;
}
private:
float x1;
float x2;
float y1;
float y2;
};
error C2629: unexpected 'class CLine ('；
error C2334: unexpected token(s) preceding '{'; skipping apparent function body；
这到底是哪儿出错了？？
