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C# MCQs

Which of the following code samples will read an integer from a byte[]?

int i; tab = new byte[32]; i = readint(tab,0,3); i = readint(tab,4,7)

byte[] bytes = { 0, 0, 0, 25 }; if (BitConverter.IsLittleEndian) Array.Reverse(bytes); int i = BitConverter.ToInt32(bytes, 0); Console.WriteLine("int: {0}", i);

public class BigEndian : Endian { protected override long FromBytes(byte[] buffer, int startIndex, int len) { long ret = 0; for (int i=0; i < len; i++) { ret = unchecked((ret << 8) | buffer[startIndex+i]); } return ret; } } public class LittleEndian : Endian { protected override long FromBytes(byte[] buffer, int startIndex, int len) { long ret = 0; for (int i=0; i < len; i++) { ret = unchecked((ret << 8) | buffer[startIndex+len-1-i]); } return ret; } }

byte[] data = ...; int startIndex = 0; int value = data[startIndex]; for (int i=1;i<4;i++) { value <<= 8; value |= data[i+startIndex]; }

Answer

Correct Answer: byte[] bytes = { 0, 0, 0, 25 }; if (BitConverter.IsLittleEndian) Array.Reverse(bytes); int i = BitConverter.ToInt32(bytes, 0); Console.WriteLine("int: {0}", i);

Explanation:

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