struct

问题 Lets say the struct is defined as : struct car { int registration_number; } I want to generate a specific number of struct instances as specified by the user. Enter number of cars: 20 #generate 20 struct instances I do not want to make an array inside struct but want a separate instance for every car. I cant understand what the protocol is to automatically generate instances. car1,car2,car3......,car n I thought I would run a loop but I cant understand how to declare new instance name

问题 sound_dirs={Ball, Daddy,Jeep, No, Tea_Pot}; The 5 variables in sound_dirs are path-char-vectors to 5 different sound folders. data_structure is a cell of (length(num_sounds) row x 3 column cell each row corresponds to a different sound first column = directory name second column = files struct for .wav files third column = formant data I want to be able to index into the files struct and do some processing on each .wav file of the same type, and then generate statistics on the group. I use

问题 I'm using realloc to increase the amount of memory for an array of structs and it doesn't seem to be increasing at all. I've read all of the posts relating to this and I can't figure out what I'm doing wrong. Here is my code: struct fileInfo { char name[MAXNAMLEN]; struct stat stbuf; }; ... struct fileInfo * newFileInfoPtr; struct fileInfo * fileInfoPtr = (struct fileInfo *) realloc (NULL, sizeof (struct fileInfo)); // loop through directory to find all filenames while ((direntPtr = readdir

问题 I am new to AJAX. I am having two drop drop list in JSP, based on selecting one value from first drop down, I need to populate values in second drop down list from Back End. I have tried to do the above functionality from AJAX in struct1.2 . I have used following Code inside onChangePrdGrp[ JavaScript Function ]: var prdGrp = document.getElementById('strProductGroup').value; if("" != prdGrp){ var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new

问题 I am new to AJAX. I am having two drop drop list in JSP, based on selecting one value from first drop down, I need to populate values in second drop down list from Back End. I have tried to do the above functionality from AJAX in struct1.2 . I have used following Code inside onChangePrdGrp[ JavaScript Function ]: var prdGrp = document.getElementById('strProductGroup').value; if("" != prdGrp){ var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new

问题 When using import struct struct.pack(">H",31001) The output is 'y\x19' , when I expected '\x79\x19' . I know that \x79 is y in ASCII, but is the information the same? Why is that one byte impacted when the other one is not? I am trying to send a modbus command and am wondering if that is causing a communication issue. I am new to modbus and am having trouble diagnosing why the slave will not respond to the master. 回答1: You are looking at the result of the repr() function, which the Python

问题 I am stumped as to how to access and change the values of a struct. The program takes in some external files and tokenized each string and categorizes them in the following fields of climate info. The external files look something like this: TDV format: TN 1424325600000 dn20t1kz0xrz 67.0 0.0 0.0 0.0 101872.0 262.5665 TN 1422770400000 dn2dcstxsf5b 23.0 0.0 100.0 0.0 100576.0 277.8087 TN 1422792000000 dn2sdp6pbb5b 96.0 0.0 100.0 0.0 100117.0 278.49207 TN 1422748800000 dn2fjteh8e80 6.0 0.0 100.0

问题 I have two questions, actually. But they are very closely related. Suppose I have a simple struct like this: public struct TradePrice { public float Price; public int Quantity; public TradePrice(float price, int quantity) { Price = price; Quantity = quantity; } } Question 1 Now if I have code somewhere that needs to access these values, is there any difference between doing this: TradePrice tp = new TradePrice(50.0f, 100); And this: float p = 50.0f; int q = 100; I feel like the first, since

问题 I'm reading in a song title, artist, and size of song. but it's only reading in the first set, after that it gives me crazy wrong values. My code is pretty simple and straight forward so I'm wondering if anyone can give me an idea of where to turn. struct Songs { string title; string artist; int men; }; // main stuff Songs song[50]; int size=0; for (int i = 0; i<size;i++) { do { getline(fin, song[size].title); getline(fin, song[size].artist); fin >> song[size].mem; size++; i++; } while (song

问题 first of all I would like to know what this python sentence does: struct.unpack("!%sH" % (len(data) / 2), data)) And secondly, I have to make an ICMP request message using python, and the thing is that I already got some code the teacher gave me to help: def step4(code, server, port): s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.getprotobyname('icmp')) CHARMAP = nonprintable_to_dots() packet = create_packet(int(code)) s.sendto(packet, (server, port)) while True: msg = s.recv(1600