Double VS Decimal In C#



If you are using double or float in financial arithmetic operations, please stop ⛔ this !!

the basic difference between double and decimal is that decimal and float is a numeric type with base 2
that means only number with base 2 are expressible in these types
while in our daily basis we use numbers with base 10, 0-9 numbers


Sample code: 

decimal dcm = 4m / 12m; // 0.3333333333333333333333333333
double dbl = 4.0 / 12.0;// 0.333333333333333
dcm + dcm + dcm + dcm + dcm + dcm; //1.9999999999999999999999999998 
dbl + dbl + dbl + dbl + dbl + dbl; //2

As you can see in the upper code there's a rounding error, 
the correct value should be 1.9  while in double it was 2

References:

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