本文整理汇总了C#中System.Math.Round方法的典型用法代码示例。如果您正苦于以下问题：C# Math.Round方法的具体用法？C# Math.Round怎么用？C# Math.Round使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Math的用法示例。
在下文中一共展示了Math.Round方法的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: foreach
decimal[] values = { 1.15m, 1.25m, 1.35m, 1.45m, 1.55m, 1.65m };
decimal sum = 0;
// Calculate true mean.
foreach (var value in values)
sum += value;
Console.WriteLine("True mean: {0:N2}", sum/values.Length);
// Calculate mean with rounding away from zero.
sum = 0;
foreach (var value in values)
sum += Math.Round(value, 1, MidpointRounding.AwayFromZero);
Console.WriteLine("AwayFromZero: {0:N2}", sum/values.Length);
// Calculate mean with rounding to nearest.
sum = 0;
foreach (var value in values)
sum += Math.Round(value, 1, MidpointRounding.ToEven);
Console.WriteLine("ToEven: {0:N2}", sum/values.Length);输出：
True mean: 1.40 AwayFromZero: 1.45 ToEven: 1.40
示例2: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
Console.WriteLine("{0,5} {1,20:R} {2,12} {3,15}\n",
"Value", "Full Precision", "ToEven",
"AwayFromZero");
double value = 11.1;
for (int ctr = 0; ctr <= 5; ctr++)
value = RoundValueAndAdd(value);
Console.WriteLine();
value = 11.5;
RoundValueAndAdd(value);
}
private static double RoundValueAndAdd(double value)
{
const double tolerance = 8e-14;
Console.WriteLine("{0,5:N1} {0,20:R} {1,12} {2,15}",
value,
RoundApproximate(value, 0, tolerance, MidpointRounding.ToEven),
RoundApproximate(value, 0, tolerance, MidpointRounding.AwayFromZero));
return value + .1;
}
private static double RoundApproximate(double dbl, int digits, double margin,
MidpointRounding mode)
{
double fraction = dbl * Math.Pow(10, digits);
double value = Math.Truncate(fraction);
fraction = fraction - value;
if (fraction == 0)
return dbl;
double tolerance = margin * dbl;
// Determine whether this is a midpoint value.
if ((fraction >= .5 - tolerance) & (fraction <= .5 + tolerance)) {
if (mode == MidpointRounding.AwayFromZero)
return (value + 1)/Math.Pow(10, digits);
else
if (value % 2 != 0)
return (value + 1)/Math.Pow(10, digits);
else
return value/Math.Pow(10, digits);
}
// Any remaining fractional value greater than .5 is not a midpoint value.
if (fraction > .5)
return (value + 1)/Math.Pow(10, digits);
else
return value/Math.Pow(10, digits);
}
}输出：
Value Full Precision ToEven AwayFromZero 11.1 11.1 11 11 11.2 11.2 11 11 11.3 11.299999999999999 11 11 11.4 11.399999999999999 11 11 11.5 11.499999999999998 12 12 11.6 11.599999999999998 12 12 11.5 11.5 12 12
示例3: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
Single value = 16.325f;
Console.WriteLine("Widening Conversion of {0:R} (type {1}) to {2:R} (type {3}): ",
value, value.GetType().Name, (double) value,
((double) (value)).GetType().Name);
Console.WriteLine(Math.Round(value, 2));
Console.WriteLine(Math.Round(value, 2, MidpointRounding.AwayFromZero));
Console.WriteLine();
Decimal decValue = (decimal) value;
Console.WriteLine("Cast of {0:R} (type {1}) to {2} (type {3}): ",
value, value.GetType().Name, decValue,
decValue.GetType().Name);
Console.WriteLine(Math.Round(decValue, 2));
Console.WriteLine(Math.Round(decValue, 2, MidpointRounding.AwayFromZero));
}
}输出：
Widening Conversion of 16.325 (type Single) to 16.325000762939453 (type Double): 16.33 16.33 Cast of 16.325 (type Single) to 16.325 (type Decimal): 16.32 16.33
示例4:
decimal result = 0.0m;
decimal posValue = 3.45m;
decimal negValue = -3.45m;
// By default, round a positive and a negative value to the nearest even number.
// The precision of the result is 1 decimal place.
result = Math.Round(posValue, 1);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, posValue);
result = Math.Round(negValue, 1);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, negValue);
Console.WriteLine();
// Round a positive value to the nearest even number, then to the nearest number away from zero.
// The precision of the result is 1 decimal place.
result = Math.Round(posValue, 1, MidpointRounding.ToEven);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", result, posValue);
result = Math.Round(posValue, 1, MidpointRounding.AwayFromZero);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", result, posValue);
Console.WriteLine();
// Round a negative value to the nearest even number, then to the nearest number away from zero.
// The precision of the result is 1 decimal place.
result = Math.Round(negValue, 1, MidpointRounding.ToEven);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", result, negValue);
result = Math.Round(negValue, 1, MidpointRounding.AwayFromZero);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", result, negValue);
Console.WriteLine();输出：
3.4 = Math.Round( 3.45, 1) -3.4 = Math.Round(-3.45, 1) 3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven) 3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero) -3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven) -3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)
示例5:
double posValue = 3.45;
double negValue = -3.45;
// Round a positive and a negative value using the default.
double result = Math.Round(posValue, 1);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, posValue);
result = Math.Round(negValue, 1);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1)\n", result, negValue);
// Round a positive value using a MidpointRounding value.
result = Math.Round(posValue, 1, MidpointRounding.ToEven);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)",
result, posValue);
result = Math.Round(posValue, 1, MidpointRounding.AwayFromZero);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)\n",
result, posValue);
// Round a negative value using a MidpointRounding value.
result = Math.Round(negValue, 1, MidpointRounding.ToEven);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)",
result, negValue);
result = Math.Round(negValue, 1, MidpointRounding.AwayFromZero);
Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)\n",
result, negValue);输出：
3.4 = Math.Round( 3.45, 1) -3.4 = Math.Round(-3.45, 1) 3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven) 3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero) -3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven) -3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)
示例6: foreach
double[] values = { 2.125, 2.135, 2.145, 3.125, 3.135, 3.145 };
foreach (double value in values)
Console.WriteLine("{0} --> {1}", value,
Math.Round(value, 2, MidpointRounding.AwayFromZero));输出：
2.125 --> 2.13 2.135 --> 2.13 2.145 --> 2.15 3.125 --> 3.13 3.135 --> 3.14 3.145 --> 3.15
示例7: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
Double[] values = { 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6,
12.7, 12.8, 12.9, 13.0 };
Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}", "Value", "Default",
"ToEven", "AwayFromZero");
foreach (var value in values)
Console.WriteLine("{0,-10:R} {1,-10} {2,-10} {3,-15}",
value, Math.Round(value),
Math.Round(value, MidpointRounding.ToEven),
Math.Round(value, MidpointRounding.AwayFromZero));
}
}输出：
Value Default ToEven AwayFromZero 12 12 12 12 12.1 12 12 12 12.2 12 12 12 12.3 12 12 12 12.4 12 12 12 12.5 12 12 13 12.6 13 13 13 12.7 13 13 13 12.8 13 13 13 12.9 13 13 13 13.0 13 13 13
示例8: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
double value = 11.1;
for (int ctr = 0; ctr <= 5; ctr++)
value = RoundValueAndAdd(value);
Console.WriteLine();
value = 11.5;
RoundValueAndAdd(value);
}
private static double RoundValueAndAdd(double value)
{
Console.WriteLine("{0} --> {1}", value, Math.Round(value,
MidpointRounding.AwayFromZero));
return value + .1;
}
}输出：
11.1 --> 11 11.2 --> 11 11.3 --> 11 11.4 --> 11 11.5 --> 11 11.6 --> 12 11.5 --> 12
示例9:
Math.Round(3.44, 1); //Returns 3.4.
Math.Round(3.45, 1); //Returns 3.4.
Math.Round(3.46, 1); //Returns 3.5.
Math.Round(4.34, 1); // Returns 4.3
Math.Round(4.35, 1); // Returns 4.4
Math.Round(4.36, 1); // Returns 4.4示例10: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
double[] values = { 2.125, 2.135, 2.145, 3.125, 3.135, 3.145 };
foreach (double value in values)
Console.WriteLine("{0} --> {1}", value, Math.Round(value, 2));
}
}输出：
2.125 --> 2.12 2.135 --> 2.13 2.145 --> 2.14 3.125 --> 3.12 3.135 --> 3.14 3.145 --> 3.14
示例11:
Console.WriteLine("Classic Math.Round in CSharp");
Console.WriteLine(Math.Round(4.4)); // 4
Console.WriteLine(Math.Round(4.5)); // 4
Console.WriteLine(Math.Round(4.6)); // 5
Console.WriteLine(Math.Round(5.5)); // 6示例12: Main
//引入命名空间
using System;
public class Example
{
public static void Main()
{
double value = 11.1;
for (int ctr = 0; ctr <= 5; ctr++)
value = RoundValueAndAdd(value);
Console.WriteLine();
value = 11.5;
RoundValueAndAdd(value);
}
private static double RoundValueAndAdd(double value)
{
Console.WriteLine("{0} --> {1}", value, Math.Round(value));
return value + .1;
}
}输出：
11.1 --> 11 11.2 --> 11 11.3 --> 11 11.4 --> 11 11.5 --> 11 11.6 --> 12 11.5 --> 12
示例13:
Console.WriteLine(Math.Round(3.44m, 1));
Console.WriteLine(Math.Round(3.45m, 1));
Console.WriteLine(Math.Round(3.46m, 1));
Console.WriteLine();
Console.WriteLine(Math.Round(4.34m, 1));
Console.WriteLine(Math.Round(4.35m, 1));
Console.WriteLine(Math.Round(4.36m, 1));输出：
3.4 3.4 3.5 4.3 4.4 4.4
示例14: for
Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}", "Value", "Default",
"ToEven", "AwayFromZero");
for (decimal value = 12.0m; value <= 13.0m; value += 0.1m)
Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}",
value, Math.Round(value),
Math.Round(value, MidpointRounding.ToEven),
Math.Round(value, MidpointRounding.AwayFromZero));输出：
Value Default ToEven AwayFromZero 12 12 12 12 12.1 12 12 12 12.2 12 12 12 12.3 12 12 12 12.4 12 12 12 12.5 12 12 13 12.6 13 13 13 12.7 13 13 13 12.8 13 13 13 12.9 13 13 13 13.0 13 13 13
示例15: Main
//引入命名空间
using System;
public class MainClass {
public static void Main() {
Console.WriteLine(Math.Round(4.4));
Console.WriteLine(Math.Round(4.5));
Console.WriteLine(Math.Round(4.6));
Console.WriteLine(Math.Round(5.5));
Console.WriteLine(Math.Round(4.54, 1));
Console.WriteLine(Math.Round(4.55, 1));
Console.WriteLine(Math.Round(4.65, 1));
Console.WriteLine(Math.Round(4.56, 1));
}
}