code 39 vb.net Custom Numeric Format Strings in Visual Basic .NET

Creator Code 128 Code Set A in Visual Basic .NET Custom Numeric Format Strings

Table 8-4. Custom Numeric Format Strings
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Format Character 0
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Comments The zero placeholder causes a digit or 0 to appear in the output string. For example:
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123.ToString("00000") = 00123
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The digit placeholder causes a digit or nothing to appear in the output string. For example:
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123.45.ToString("#####") = 123
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The decimal point identifies the position of the first decimal place. For example:
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123.45.ToString("#####.000") = 123.450
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The comma indicates that thousands separators should be used. For example:
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12345678.ToString("#,#") = 12,345,678
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The percent symbol causes the number to be multiplied by 100 and displayed as a percentage. For example:
0.1234.ToString("%#.00") = %12.34
8. Numbers and Dates
E0, E+0, E- Use scientific notation. For example: 0, e0, e+0,e-0 \
1234.ToString("0.##E+000") = 1.23E+003 1234.ToString("0.##e+000") = 1.23e+003 1234.ToString("0.##e0") = 1.23e3
The backslash escapes the next character. For example:
1234.ToString("##\t##") = 12 34
Different formats can be specified for use with positive and negative numbers and 0. The semicolon is used to separate these format elements. For example:
1234.ToString("##;(##);zero") = 1234 (1234).ToString("##;(##);zero") = (1234) 0.ToString("##;(##);zero") = zero
Other
Other characters are copied to the output string without affecting numeric formatting. For example:
12345.ToString("A[##][00]") = A[123][45]
Mathematical Functions
The java.lang.Math class is equivalent to the .NET System.Math class. Both classes provide a set of constants and static methods for performing mathematical operations. The methods common to both System.Math and java.lang.Math are, using the .NET names, as follows: Acos, Asin, Atan, Atan2, Ceiling, Cos, Exp, Floor, IEEERemainder, Max, Min, Pow, Sin, Sqrt, and Tan. Table 8-5 highlights the differences between the java.lang.Math and System.Math classes.
Table 8-5. Differences in Static Members of java.lang.Math and System.Math
Java abs() N/A log() N/A random() rint() round()
Comments .NET provides overloads that take a larger range of parameter types. Returns the hyperbolic cosine of the specified angle. .NET provides an overloaded Log method that allows the base of the logarithm to be specified. Log10() A convenience method for getting the base 10 logarithm of a number. N/A See the next section, "Random Numbers." Round() The .NET Round method is more like Java rint than round. It returns a floating-point representation of the rounded number as opposed to an integer value. .NET provides an overloaded Round method that supports rounding to a specified precision. Sign() Returns a value indicating the sign of the specified number. Sinh() Returns the hyperbolic sine of the specified angle. Tanh() Returns the hyperbolic tangent of the specified angle.
.NET Abs() Cosh() Log()
N/A N/A N/A
8. Numbers and Dates
toDegrees() N/A toRadians() N/A
Random Numbers
The Java class java.util.Random and the .NET equivalent System.Random are simple classes for generating pseudorandom numbers. These classes are not suitable for high-security or cryptography applications.
Note
The .NET System.Security.Cryptography namespace includes mechanisms for the generation of secure random numbers (SRNs).
Both Random classes act as number generators, providing a stream of random numbers in response to method calls. Instantiation of both classes is the same except when specifying a seed; java.util.Random takes a long, whereas System.Random takes an int. Once created, the .NET System.Random class cannot have its seed changed, whereas the Java class provides the setSeed method. Java offers greater flexibility in the type of result returned from Random, including support for Boolean values and a wider selection of numeric types. Table 8-6 summarizes the methods of the Java and .NET Random classes.
Table 8-6. A Comparison between Java and .NET Random Classes
Java .NET Comments Constructors Random() Random() Random(long) Random(int) Uses the specified value as the seed for the random number generation algorithm. Methods nextBoolean() N/A nextBytes() NextBytes() nextDouble() NextDouble() N/A nextFloat() nextGaussian() N/A nextInt() Next() nextInt(int) Next(int) N/A Next(int, int) Returns a positive random integer between the specified values. N/A nextLong() N/A .NET Random seed is set only during construction. setSeed()
8. Numbers and Dates
Dates and Times
The primary class for representing an instance of time in Java is java.util.Date. Many of the methods in Date are deprecated and replaced by functionality contained in the java.util.Calendar and java.text.DateFormat classes. The .NET mechanism for representing an instant of time is the System.DateTime struct. Instances of DateTime are always associated with an instance of System.Calendar. This relationship allows DateTime to provide functionality equivalent to a combination of the Java Date and Calendar classes. Through implementation of the IFormattable interface, described in 7, and methods to parse string values, the .NET DateTime class includes functionality comparable to the Java DateFormat class. A number of fundamental differences exist between how Java and .NET represent dates and times through the System.DateTime and java.util.Date classes:
Java Date represents an int offset from January 1, 1970, 00:00:00 GMT; .NET DateTime represents a long offset from January 1, 0001 CE, 12:00:00. CE stands for Common Era and is equivalent to AD in the Gregorian calendar. Java Date measures the offset in milliseconds. .NET defines the tick that all DateTime offsets are measured in. One tick equals 100 nanoseconds; 1 millisecond equals 10,000 ticks. .NET DateTime is a struct and hence a value type; any calls to methods on a DateTime instance will implicitly box the instance. .NET DateTime is immutable, whereas Java Date can be reused through the setTime method. .NET DateTime instances can be compared using standard arithmetic operators such as ==, !=, <, >, >=, and <=.
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