Converting a double to an int in C

Question

In our code we have a double that we need to convert to an int   double score   8 6  int i1   Convert ToInt32 score   int i2    int score    Can anyone explain me why i1    i2   The result that I get is that  i1   9 and i2   8

User · Answer

ToInt32 rounds   Casting to int just throws away the non-integer component

User · Answer

Because Convert ToInt32 rounds      Return Value  rounded to the nearest 32-bit signed integer  If value   is halfway between two whole numbers  the even number is returned    that is  4 5 is converted to 4  and 5 5 is converted to 6       while the cast truncates      When you convert from a double or float value to an integral type  the   value is truncated    Update  See Jeppe Stig Nielsen s comment below for additional differences  which however do not come into play if score is a real number as is the case here

User · Answer

Casting will ignore anything after the decimal point  so 8 6 becomes 8   Convert ToInt32 8 6  is the safe way to ensure your double gets rounded to the nearest integer  in this case 9

User · Answer

you can round your double and cast ist    int Math Round myDouble

User · Answer

In the provided example your decimal is 8 6  Had it been 8 5 or 9 5  the statement i1    i2  might have been true  Infact it would have been true for 8 5  and false for 9 5    Explanation    Regardless of the decimal part  the second statement  int i2    int score will discard the decimal part and simply return you the integer part  Quite dangerous thing to do  as data loss might occur   Now  for the first statement  two things can happen  If the decimal part is 5  that is  it is half way through  a decision is to be made  Do we round up or down  In C   the Convert class implements banker s rounding  See this answer for deeper explanation  Simply put  if the number is even  round down  if the number is odd  round up   E g  Consider           double score   8 5          int i1   Convert ToInt32 score      8         int i2    int score                 8          score    1          i1   Convert ToInt32 score          10         i2    int score                     9

[c#] Converting a double to an int in C#

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