bit | 易学教程

2019 SDN上机第7次作业

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1.根据P4教程，将basic案例程序补充完整，成功运行（1）补充完整代码如下 /* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen;

2019 SDN上机第7次作业

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64bit random number between a range

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问题 So I have been searching for a couple of days for a functions which takes 2 arguments a low value and a high value(both of which 64bits ints) than generates a random number between these ranges. The problem I keep encountering is that the number just isn't a 64 bit int. or the number at the edges are more common than the ones in the middle. Here is some code: it just keeps returning either -1 or 0... #include<stdio.h> #include<stdlib.h> #include<inttypes.h> int64_t range1=0,range2

Cumulative bitwise operations

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问题 Suppose you have an Array A = [x, y, z, ...] And then you compute a prefix/cumulative BITWISE-OR array P = [x, x | y, x | y | z, ... ] If I want to find the BITWISE-OR of the elements between index 1 and index 6 , how can I do that using this precomputed P array? Is it possible? I know it works in cumulative sums for getting sum in a range, but I am not sure with bit operations. Edit: duplicates ARE allowed in A , so A = [1, 1, 2, 2, 2, 2, 3] is a possibility. 回答1: There is impossible to use

Rotate a bitmap represented by an array of bytes

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问题 In an AVR, I'm using an array of eight bytes to store a picture displayed on an 8x8 LED matrix. The picture needs to be rotated from time to time. So, given the picture ┘ defined as: uint8_t rows[8] = { 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b11111111 }; I want to "rotate" this anticlockwise to get ┐ as: uint8_t rows2[8] = { 0b11111111, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000001 }; Or this if done clockwise,

How to generate desired size (example 8096) long bit hash codes - c# [closed]

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问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . There are many hashing methods but I want to compose bit hash with 8096 bits long. Is it possible to achieve this? For example when I enter "House" I should get a string like: "0101010001010101..." (8096 bits)

2019 SDN上机第7次作业

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basic补充 /* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen; bit<16> identification; bit<3>

checking the number of bits ON in a byte?

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问题 I know we can set any bit in the byte by using logical OR and can clear any bit by logical AND like to val |= (1<<order_number_of_bit_to_set); //for setting some specific number of bit and for clearing a bit val &= ~(1<<order_number_of_bit_to_clear); // specific bit to clear but my question is how can we check that how many and which ordered number bits are set in the byte. for example if we have val = 0x22; it means that 2nd and 5th bit is set in the byte what is the efficient, quick and

ASCII table and character presentation

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问题 We learn in class about ASCII table, and that every character from 128 characters has a unique number from 0-128 representing it. For example "a" is 97 (in binary 97 is 1100001). "%" is 37 (and in binary 37 is 0100101). (I understand that for a fixed length of 7 we should allow the binary number start with 0) If 97 is representing "a", then what represents the string "97"? What represents the integer 97? 回答1: I think your question is based on the notion that, given a representation of an

How to insert 1 or 0 in Sql Server for bit type field if checkbox is checked?

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问题 I am trying to insert 1 or 0 in my SQL Server Database, and my data type is "bit". I have tried doing this but it says incorrect syntax near where- dt=g1.ExecDB( insert into tbl ("check1,check2,check3") values('" + Convert.ToByte(check1.Checked) + "','" + Convert.ToByte(check2.Checked) + "','" + Convert.ToByte(check3.Checked) + "' ) ) where loginname = '"+Session["log"].ToString() + "'" ) ; Please Guide me where I am doing wrong? 回答1: Adding the name of your checkboxes inside the sql string