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Random::Next Method (Int32)
Visual Studio 2010
Returns a nonnegative random number less than the specified maximum.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- maxValue
- Type: System::Int32
The exclusive upper bound of the random number to be generated. maxValue must be greater than or equal to zero.
Return Value
Type: System::Int32A 32-bit signed integer greater than or equal to zero, and less than maxValue; that is, the range of return values ordinarily includes zero but not maxValue. However, if maxValue equals zero, maxValue is returned.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | maxValue is less than zero. |
The following example generates random integers with various overloads of the Next method.
// Example of the Random::Next( ) methods. using namespace System; // Generate random numbers with no bounds specified. void NoBoundsRandoms( int seed ) { Console::WriteLine( "\nRandom object, seed = {0}, no bounds:", seed ); Random^ randObj = gcnew Random( seed ); // Generate six random integers from 0 to int.MaxValue. for ( int j = 0; j < 6; j++ ) Console::Write( "{0,11} ", randObj->Next() ); Console::WriteLine(); } // Generate random numbers with an upper bound specified. void UpperBoundRandoms( int seed, int upper ) { Console::WriteLine( "\nRandom object, seed = {0}, upper bound = {1}:", seed, upper ); Random^ randObj = gcnew Random( seed ); // Generate six random integers from 0 to the upper bound. for ( int j = 0; j < 6; j++ ) Console::Write( "{0,11} ", randObj->Next( upper ) ); Console::WriteLine(); } // Generate random numbers with both bounds specified. void BothBoundsRandoms( int seed, int lower, int upper ) { Console::WriteLine( "\nRandom object, seed = {0}, lower = {1}, upper = {2}:", seed, lower, upper ); Random^ randObj = gcnew Random( seed ); // Generate six random integers from the lower to // upper bounds. for ( int j = 0; j < 6; j++ ) Console::Write( "{0,11} ", randObj->Next( lower, upper ) ); Console::WriteLine(); } int main() { Console::WriteLine( "This example of the Random::Next( ) methods\n" "generates the following output.\n" ); Console::WriteLine( "Create Random objects all with the same seed and " "generate\nsequences of numbers with different " "bounds. Note the effect\nthat the various " "combinations of bounds have on the sequences." ); NoBoundsRandoms( 234 ); UpperBoundRandoms( 234, Int32::MaxValue ); UpperBoundRandoms( 234, 2000000000 ); UpperBoundRandoms( 234, 200000000 ); BothBoundsRandoms( 234, 0, Int32::MaxValue ); BothBoundsRandoms( 234, Int32::MinValue, Int32::MaxValue ); BothBoundsRandoms( 234, -2000000000, 2000000000 ); BothBoundsRandoms( 234, -200000000, 200000000 ); BothBoundsRandoms( 234, -2000, 2000 ); } /* This example of the Random::Next( ) methods generates the following output. Create Random objects all with the same seed and generate sequences of numbers with different bounds. Note the effect that the various combinations of bounds have on the sequences. Random object, seed = 234, no bounds: 2091148258 1024955023 711273344 1081917183 1833298756 109460588 Random object, seed = 234, upper bound = 2147483647: 2091148258 1024955023 711273344 1081917183 1833298756 109460588 Random object, seed = 234, upper bound = 2000000000: 1947533580 954563751 662424922 1007613896 1707392518 101943116 Random object, seed = 234, upper bound = 200000000: 194753358 95456375 66242492 100761389 170739251 10194311 Random object, seed = 234, lower = 0, upper = 2147483647: 2091148258 1024955023 711273344 1081917183 1833298756 109460588 Random object, seed = 234, lower = -2147483648, upper = 2147483647: 2034812868 -97573602 -724936960 16350718 1519113864 -1928562472 Random object, seed = 234, lower = -2000000000, upper = 2000000000: 1895067160 -90872498 -675150156 15227793 1414785036 -1796113767 Random object, seed = 234, lower = -200000000, upper = 200000000: 189506716 -9087250 -67515016 1522779 141478503 -179611377 Random object, seed = 234, lower = -2000, upper = 2000: 1895 -91 -676 15 1414 -1797 */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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