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  1. #include <iostream>
  2. #include <c.math>
  3. using namespace std;
  4.  
  5. int main ()
  6. {
  7. 	unsigned long long int n, sum=0, m;
  8. 	cin >> n;
  9.     m= abs (n);
  10. 	sum= (1 + m) * m / 2;
  11. 	if (n>0)
  12. 		cout << sum;
  13. 	if (n==0)
  14. 		cout << 1;
  15. 	else
  16. 	{
  17. 		sum= *-1;
  18. 		cout << sum + 1;
  19. 	}
  20. 	return 0;
  21. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:2:18: fatal error: c.math: No such file or directory
 #include <c.math>
                  ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/mp9Tat
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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