ex03-04.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 27 行

//EX03-04.cpp
#include <iostream.h>
#include <conio.h>
void main()
{ int sum=0,i,n;
  cout << "Enter n="; cin >> n;    // 1)
  for (i=1;i<=n;i+=2)
  sum += i;
  for (i=2;i<=n;i+=2)
  sum -=i;
  cout << "1-2+3-4+5...+n="<<sum<<endl;
  float total=0;
  for (i=1;i<=n;i++)
  total += float(i) / n;
  cout <<"1/n+2/n+...+1="<<total<<endl; // 2)
  total =0;
  for (i=1;i<=100;i+=2)
  total += float (n)/float(i);
  for (i=2;i<=100;i+=2)
  total -= float (n)/float(i);
  cout <<"n/1-n/2+n/3-....-n/100="<<total<<endl; // 3)
  total=0;
  for (i=1;i<=n;i++)
  total +=1/float(i);
  cout <<"1+1/2+1/3+1/4+...+1/n="<<total;	 // 4)
  getch();
}