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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. template <typename T> double sgn(T val) {
  6.     return double((T(0) < val) - (val < T(0)))/(val == val);
  7. }
  8.  
  9. int main() {
  10.   cout << "sgn(-1)       : " << sgn(-1) << endl;
  11.   cout << "sgn(0)        : " << sgn(0) << endl;
  12.   cout << "sgn(1)        : " << sgn(1) << endl;
  13.   cout << "sgn(-INFINITY): " << sgn(-INFINITY) << endl;
  14.   cout << "sgn(-1.0)     : " << sgn(-1.0) << endl;
  15.   cout << "sgn(-0.0)     : " << sgn(-0.0) << endl;
  16.   cout << "sgn(0.0)      : " << sgn(+0.0) << endl;
  17.   cout << "sgn(+1)       : " << sgn(+1.0) << endl;
  18.   cout << "sgn(INFINITY) : " << sgn(+INFINITY) << endl;
  19.   cout << "sgn(NAN)      : " << sgn(NAN) << endl;
  20.   cout << "sgn(-NAN)     : " << sgn(-NAN) << endl;
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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sgn(-1)       : -1
sgn(0)        : 0
sgn(1)        : 1
sgn(-INFINITY): -1
sgn(-1.0)     : -1
sgn(-0.0)     : 0
sgn(0.0)      : 0
sgn(+1)       : 1
sgn(INFINITY) : 1
sgn(NAN)      : -nan
sgn(-NAN)     : -nan
https://ideone.com/VulkXo
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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