C # rounding

Reprinted from: http://dlix.bokee.com/5956750.html

C #, java, and vbscriptFour Homes, six in five into two (explained below).
SQL server uses rounding.

C # For example, Math. Round (1.25, 1) = 1.2.

In SQL, select round (1.25, 1) returns 1.3.

Reference code for rounding in C:

For example, if 2.45 is to be rounded to the last decimal place, you can first give 2.45*10, then add 0.5, then get the integer, and then divide it by 10.

Public double C1Round (double value, int digit)
{
Double vt = Math. Pow (10, digit );
Double vx = value * vt;

X + = 0.5;
Return (Math. Floor (vx)/vt );
}

Four Homes, six in five into double 

Four Homes, six in five into two is an accurate counting retention method. the rounding rule is "four homes six into five into two". Here "four" means less than five, and "six" means more than five, "5" is the ending number of the rounded bits. If we look at the first bid, we will not enter the odd bid, just like 1.25. Because 2 is an even bid, It is 1.2. Another example is 1.35. Because 3 is an odd number, it is 1.4. Obviously, this is required for data statistics.

From a statistical point of view, "four homes, six homes, five into two" is more scientific than "four homes and five into five", which makes some of the results after rounding bigger, some smaller, more even. instead of rounding in five, the result tends to be large.
For example, if the value is 1.15 + 1.25 + 1.35 + 1.45 = 5.2, if the number is rounded to a decimal place
1.2 + 1.3 + 1.4 + 1.5 = 5.4
According to the calculation of "four homes, six in five into two", 1.2 + 1.2 + 1.4 + 1.4 = 5.2, the rounding result can better reflect the actual results

 

Author: Ice dish
Source: http://www.cnblogs.com/icebutterfly/
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