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  1.     #include <iostream>
  2.     #include <sstream>
  3.     #include <math.h>
  4.     using namespace std;
  5.  
  6.     int GetDecimalsUsingString( float number );
  7.     int GetDecimals( float number, int num_decimals );
  8.  
  9.     int main() {
  10.     	float x = -1234.5678;
  11.         int x1 = (int) x;   // which would return 1234 great.
  12.         float remainder = x - static_cast< float > ( x1 );
  13.         std::cout << "Original : " << x << std::endl;
  14.         std::cout << "Before comma : " << x1 << std::endl;
  15.         std::cout << "Remainder : " << remainder << std::endl;
  16.  
  17.         // "Ugly" way using std::stringstream and std::string
  18.         int res_string = GetDecimalsUsingString( remainder );
  19.  
  20.         // Nicer, but requires that you specify number of decimals
  21.         int res_num_decimals = GetDecimals( remainder, 6 );
  22.  
  23.         std::cout << "Result using string : " << res_string << std::endl;
  24.         std::cout << "Result using known number of decimals : " << res_num_decimals << std::endl;
  25.     	return 0;
  26.     }
  27.  
  28.     int GetDecimalsUsingString( float number )
  29.     {
  30.     	// Put number in a stringstream
  31.     	std::stringstream ss;
  32.         ss << number;
  33.  
  34.         // Put content of stringstream into a string
  35.         std::string str = ss.str();
  36.  
  37.         // Remove the first part of the string ( minus symbol, 0 and decimal point)
  38.         if ( number < 0.0 )
  39.             str = str.substr( 3, str.length() - 1);
  40.         else
  41.             str = str.substr( 2, str.length() - 1);
  42.  
  43.         // Convert string back to int
  44.         int ret =  std::strtol( str.c_str(), NULL, 10 );
  45.  
  46.         /// Preserve sign
  47.         if ( number < 0 )
  48.         	ret *= -1;
  49.  
  50.         return ret;
  51.     }
  52.     int GetDecimals( float number, int num_decimals )
  53.     {
  54.     	int decimal_multiplier = pow( 10, num_decimals );
  55.     	int result = number *  decimal_multiplier;
  56.  
  57.     	return result;
  58.     }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
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Standard input is empty
stdout
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Original : -1234.57
Before comma : -1234
Remainder : -0.567749
Result using string : -567749
Result using known number of decimals : -567749
https://ideone.com/N4Bifu
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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