How to round up value C to the nearest integer

Question

I want to round up double to int   Eg   double a 0 4  b 0 5    I want to change them both to integer   so that   int aa 0  bb 1    aa is from a and bb is from b   Any formula to do that

User · Accepted Answer

Use Math Ceiling to round up  Math Ceiling 0 5      1   Use Math Round to just round  Math Round 0 5  MidpointRounding AwayFromZero      1   And Math Floor to round down  Math Floor 0 5      0

User · Answer

Math Round     Rounds a double-precision floating-point value to the nearest integral value

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Use a function in place of MidpointRounding AwayFromZero   myRound 1 11125 4    Answer - 1 1114  public static Double myRound Double Value  int places   1000        Double myvalue    Double Value      if  places    1000                if  myvalue -  int myvalue    0 5                        myvalue   myvalue   0 1              return  Double Math Round myvalue                     return  Double Math Round myvalue           places   myvalue ToString   Substring myvalue ToString   IndexOf        1  Length - 1        if   myvalue   Math Pow 10  places   -  int  myvalue   Math Pow 10  places    gt  0 49                myvalue    myvalue   Math Pow 10  places   1     1          myvalue    myvalue   Math Pow 10  places   1              return  Double Math Round myvalue  places

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It is simple  So follow this code   decimal d   10 5  int roundNumber    int Math Floor d   0 5     Result is 11

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The  NET framework uses banker s rounding in Math Round by default  You should use this overload   Math Round 0 5d  MidpointRounding AwayFromZero     1 Math Round 0 4d  MidpointRounding AwayFromZero     0

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It is also possible to round negative integers     performing d   c   3 4 where d can be pos or neg d     c   a      c gt 0   b gt  gt 1  - b gt  gt 1       b     explanation     1   multiply           c   a      2   if c is negative    c gt 0  subtract half of the dividend                                   b gt  gt 1  is bit shift right    b 2         if c is positive   else  add half of the dividend     3   do the division    on a C51 52  8bit embedded  or similar like ATmega the below code may execute in approx 12cpu cycles  not tested    Extended from a tip somewhere else in here  Sorry  missed from where      Example test  integer rounding example including negative    include  lt stdio h gt   include  lt string h gt   int main           rounding negative int       doing something like d   c   3 4    int a 3     int b 4     int c -5     int d     int s c     int e c 10       for int f s  f lt  e  f            printf   d t  f          double cd f  ad a  bd b   dd            d   c   3 4  with double       dd   cd   ad   bd         printf    2f t  dd         printf    1f t  dd                 printf    0f t  dd             try again with typecast have used that a lot in Borland C   35 years ago        maybe evolution has overtaken it                 doing div before mul on purpose       dd   double c     double a    double b         printf    2f t  dd          c f           d   c   3 4  with integer rounding       d     c   a      c gt 0   b gt  gt 1  - b gt  gt 1       b        printf   d t  d         puts           return 0        test output in  2f     1f   0f cast int    -5  -3 75   -3 8    -4  -3 75   -4   -4  -3 00   -3 0    -3  -3 75   -3   -3  -2 25   -2 2    -2  -3 00   -2   -2  -1 50   -1 5    -2  -2 25   -2   -1  -0 75   -0 8    -1  -1 50   -1    0   0 00    0 0     0  -0 75    0    1   0 75    0 8     1   0 00    1    2   1 50    1 5     2   0 75    2    3   2 25    2 2     2   1 50    2    4   3 00    3 0     3   2 25  3      5   3 75    3 8     4   3 00        by the way evolution      Is there any decent small integer library out there for that by now

User · Answer

Check out Math Round   You can then cast the result to an int

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Another option   string strVal    32 11      will return 33    string strVal    32 00     returns 32    string strVal    32 98     returns 33  string   valStr   strVal Split        int32 leftSide   Convert ToInt32 valStr 0    int32 rightSide   Convert ToInt32 valStr 1     if  rightSide  gt  0      leftSide   leftSide   1    return  leftSide

User · Answer

Math Round 0 5  returns zero due to floating point rounding errors  so you ll need to add a rounding error amount to the original value to ensure it doesn t round down  eg   Console WriteLine Math Round 0 5  0  ToString        outputs 0      Console WriteLine Math Round 1 5  0  ToString        outputs 2 Console WriteLine Math Round 0 5   0 00000001  0  ToString        outputs 1 Console WriteLine Math Round 1 5   0 00000001  0  ToString        outputs 2 Console ReadKey

[c#] How to round up value C# to the nearest integer?

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