循环15~17

来源：互联网发布：淘宝店铺如何快速升钻编辑：程序博客网时间：2024/06/05 23:55

循环15

#include<iostream>
bool just(long n);
int main()
{
using namespace std;
long a, b; int count = 0; long sum = 0;
cout << "Enter 2 integer between 1 and 500 :";
cin >> a >> b;
for (int i = a; i < b + 1; i++)
{
  if (just(i))
  {
   count++;
   sum += i;
  }
}
cout << count << ' ' << sum << endl;
return 0;
}
bool just(long n)
{
if (n == 2)
  return true;
else if (n % 2 == 0)
  return false;
int mark = 0;
for (int i = 3; i < n / 2 + 1; i += 2)
{
  if (n % i == 0)
   mark = 1;
}
if (mark == 0)
  return true;
else
  return false;
}

循环16

#include<iostream>
int main()
{
using namespace std;
int n; int sum = 1;
cout << "Enter eat day ,between 2 to 10:"; cin >> n;
for (int i = 2; i < n + 1; i++)
{
sum = 2 * (sum + 1);
}
cout << sum << endl;
return 0;
}

循环17

#include<iostream>
int main()
{
using namespace std;
int one; char ch; int two;
cout << "Enter your quation :";
cin >> one;
while (cin >> ch &&ch!='=')
{
  cin >> two;
  switch (ch)
  {
  case'+':one = one + two; break;
  case'-':one = one - two; break;
  case'*':one = one*two; break;
  case'/':
  {if (two == 0)
   break;
  else
   one = one / two; break; }
  default:
   cout << "Error .\n";
  }
}
cout << one << endl;
return 0;
}

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