ex07-01.cpp

来自「在c环境下的对数据结构进行讲解,包含有例题及答案」· C++ 代码 · 共 23 行

//EX07-01.cpp
#include <iostream.h>	//cout,cin
#include <conio.h>		// getch()
#include <math.h>			// sqrt	
float distance(float ,float ,float ,float);
float vdistance(float ,float ,float ,float ,float);
void main()
{ float x1,y1,x2,y2,a=3,b=4,c=5,d,vd;
  cout << "x1,y1=";cin>>x1>>y1;
  cout << "x2,y2=";cin>>x2>>y2;
  d = distance(x1,y1,x2,y2);
  vd = vdistance(a,b,c,x1,y1);
  cout << "d="<<d
       << "\nvd="<<vd;
  getch();
}
float distance(float x1,float y1,float x2,float y2)
{ return sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));}

float vdistance(float a,float b, float c, float x1,float y1)
{ return (a*x1+b*y1+c)/sqrt(a*a+b*b); }