Wuying283 - 1 year ago 138

C# Question

I'm testing a small C# program fragment:

`short min_short = (short)(int)-Math.Pow(2,15);`

short max_short = (short)(int)(Math.Pow(2, 15) - 1);

Console.WriteLine("The min of short is:{0};\tThe max of short is:{1}", min_short, max_short);

int min_int = (int)-Math.Pow(2, 31);

int max_int = (int)(Math.Pow(2, 31) - 1);

Console.WriteLine("The min of int is:{0};\tThe max of int is:{1}", min_int, max_int);

uint min_uint = 0;

uint max_uint = (uint)(Math.Pow(2, 32) - 1);

Console.WriteLine("The min of uint is:{0};\tThe max of uint is:{1}", min_uint, max_uint);

long min_long = (long)-Math.Pow(2, 63);

long max_long = (long)(Math.Pow(2, 63) - 1);

Console.WriteLine("The min of long is:{0};\tThe max of long is:{1}", min_long, max_long);

ulong min_ulong = 0;

ulong max_ulong = (ulong)(Math.Pow(2, 64) - 1);

Console.WriteLine("The min of ulong is:{0};\tThe max of ulong is:{1}", min_ulong, max_ulong);

The output is:

`The min of ushort is:0; The max of ushort is:65535`

The min of short is:-32768; The max of short is:32767

The min of int is:-2147483648; The max of int is:2147483647

The min of uint is:0; The max of uint is:4294967295

The min of long is:-9223372036854775808;The max of long is:-9223372036854775808

The min of ulong is:0; The max of ulong is:0

I suspect that the mistake is caused by the function of Math.Pow(),which is double type returned.

`public static double Pow(`

double x,

double y

)

so,my question is: Is there has a similar Math function for long type?

How to correct the errors in the program fragment above.

Many thanks!

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Answer Source

You reached `Math.Pow`

limit.
You would need to use `System.Numerics.BigInteger.Pow`

.