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  1. #include <iostream>
  2. #include <math.h>
  3.  
  4. char *int2str(int input)
  5. {
  6. 	if (input == 0)
  7. 		return "0";
  8. 	bool negative = false;
  9. 	if (input < 0)
  10. 	{
  11. 		input = abs(input);
  12. 		negative = true;
  13. 	}
  14. 	int digits = log10(input) + 1;
  15. 	char *output = new char[digits + (negative ? 2 : 1)];
  16. 	char *current_char = output;
  17. 	if (negative)
  18. 	{
  19. 		output[0] = '-';
  20. 		current_char++;
  21. 	}
  22. 	int current_num = input;
  23. 	for (int current_digit = digits - 1; current_digit >= 0; current_digit--)
  24. 	{
  25. 		int p = pow(10, current_digit);
  26. 		int d = current_num / p;
  27. 		current_num -= p * d;
  28. 		*current_char = '0' + d;
  29. 		current_char++;
  30. 	}
  31. 	*current_char = '\0';
  32. 	return output;
  33. }
  34.  
  35. int main()
  36. {
  37. 	printf("%s\n%s\n%s", int2str(-999), int2str(54321), int2str(0));
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
-999
54321
0
https://ideone.com/icrR2U
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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