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  1. #include<iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     double a, p, q, r, s;
  6.     cout << "入力した整数の平方根を求めるプログラム" << endl;
  7.     cout << "正の整数を入力してください :";
  8.     cin >> a;
  9.     if (a < 0.0) {
  10.         cout << "正の整数を入力してください" << endl;
  11.     } else if (a == 0.0) {
  12.         cout << 0;
  13.     } else {
  14.         p = 0.0;
  15.         q = a + 1.0;
  16.         while (1) {
  17.             r = (p + q) / 2.0;
  18.             if (r == p || r == q)
  19.                 break;
  20.             s = r * r;
  21.             if (s == a)
  22.                 break;
  23.             else if (s < a)
  24.                 p = r;
  25.             else
  26.                 q = r;
  27.         }
  28.         cout << "√" << a << " = " << r << endl;
  29.     }
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 3476KB
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入力した整数の平方根を求めるプログラム
正の整数を入力してください :√2 = 1.41421
https://ideone.com/U94bCS
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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