406.cpp

来自「C++实训教程」· C++ 代码 · 共 33 行

//406.CPP  DEMO 三种传递函数参数方式
#include <iostream.h>
float FtToM1(float feet);
void  FtToM2(float*pf);
float FtToM3(float&r);
float const C = 0.305; //must be global
main()
{
  float value = 10, *p = &value;
  cout << FtToM1(value) <<endl;
  //FtToM2(p);    cout << *p <<endl;
  FtToM2(&value); cout <<value<<endl;
  value = 10;
  cout << FtToM3(value) << endl;
  cout << "now value=" << value << endl;
  return 0;
}
float FtToM1(float feet)
{  return C*feet;}
void  FtToM2(float*pf)
{  *pf *= C;}
float FtToM3(float& r)
{
	r *= C ;
	return r;
}
/*
3.05
3.05
3.05
now value=3.05
*/