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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4.     for (double a, b; cin >> a >> b; ) {
  5.         cout << "a=" << a << ", " << "b=" << b;
  6.         if (0 < a && a < b) {
  7.             cout << " => " << (a * a + b * b) / (2 * a) << endl;
  8.         } else {
  9.             cout << " => error." << endl;
  10.         }
  11.     }
  12. }
  13.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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1 2
2 4
stdout
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a=1, b=2 => 2.5
a=2, b=4 => 5
https://ideone.com/Mvx9Mp
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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