strtok

问题 Could someone explain me what differences there are between strtok() and strsep() ? What are the advantages and disadvantages of them? And why would I pick one over the other one. 回答1: From The GNU C Library manual - Finding Tokens in a String: One difference between strsep and strtok_r is that if the input string contains more than one character from delimiter in a row strsep returns an empty string for each pair of characters from delimiter. This means that a program normally should test

问题 I have a string that I would like to tokenize. But the C strtok() function requires my string to be a char* . How can I do this simply? I tried: token = strtok(str.c_str(), " "); which fails because it turns it into a const char* , not a char* 回答1: #include <iostream> #include <string> #include <sstream> int main(){ std::string myText("some-text-to-tokenize"); std::istringstream iss(myText); std::string token; while (std::getline(iss, token, '-')) { std::cout << token << std::endl; } return 0

问题 Im trying to take a user input string and parse is into an array called char *entire_line[100]; where each word is put at a different index of the array but if a part of the string is encapsulated by a quote, that should be put in a single index. So if I have char buffer[1024]={0,}; fgets(buffer, 1024, stdin); example input: "word filename.txt "this is a string that shoudl take up one index in an output array"; tokenizer=strtok(buffer," ");//break up by spaces do{ if(strchr(tokenizer,'"')){/

问题 <?php $string = "sandesh commented on institue international institute of technology"; /* Use tab and newline as tokenizing characters as well */ $tok = strtok($string, " \n\t"); echo $tok ?> The above code gives me output sandesh. But if I want the output "commented on institute international institute of technology", then how should I modify the above code. Thanks and Regards Sandesh 回答1: <?php $string = "sandesh commented on institue international institute of technology"; echo substr(

问题 I tried to write a function that gets a pointer to array of char, reads a string from the user and remove all spaces in the start of the string till the first char that is not string appear. Finally return the copy of the string without space/s in the begining. For example, for input abcd the function should return pointer to the string abcd . for input 123 123 the function should return pointer to string 123 123 . The function is shown below, void read_RemoveSpace(char * str)/**read the rest

问题 So if I have the following char array in C: "a b c" // where "a", "b", and "c" can be char arrays of any length and the // space between them can be of any length How can I remove the "a" token but store the rest "b c" in an char pointer? So far I have implemented the following method that doesn't work: char* removeAFromABC(char* a, char* abc) { char* abcWithoutA[MAXIMUM_LINE_LENGTH + 1]; int numberOfCharsInA = strlen(a); strcpy(abcWithoutA, (abc + numberOfCharsInA)); return abcWithoutA; }

问题 Some details Language: C System: Linux; working with command line (terminal), files are read in through the terminal User experience with C: 3 months I have been trying to extract the extension of a given file for example "myfile.wld", so that later I can make a check to see if the right type of file has been entered at the terminal before I work on the contents of the file. This is necessary for an assignment I have used the function "strtok" to separate the input into sections by a

问题 I am a C newbie and learning string tokenizing. I am trying to compare two strings in the following way. But the string comparison I am doing is failing. Can you please let me know what I am missing here? I couldn't find another similar question, may be due to my inexperience in C. If one exists, can you please redirect me to it? char* input = "comparer here"; char* args[5]; int counter = 0; char *tok = strtok(input, " "); while (tok != NULL) { args[counter] = tok; counter ++; if (counter ==

问题 #include <stdio.h> #include <string.h> /* needed for strtok */ #include <unistd.h> #include <stdlib.h> int main(int argc, char **argv) { char text[10000]; fgets(text, sizeof(text), stdin); char *t; int i; t = strtok(text, "\"\'| "); for (i=0; t != NULL; i++) { printf("token %d is \"%s\"\n", i, t); t = strtok(NULL, "\"\'| "); } } This is part of the code that im trying to make it is supposed to separate tokens Let's say the input is 'abc' "de f'g" hij| k "lm | no" The output should be token 1:

问题 Ok, so I have the code char *token; char *delimiter = " "; token = strtok(command, delimiter); strcpy(command, token); token = strtok(NULL, delimiter); strcpy(arguments, token); and it gives me EXC_BAD_ACCESS when i run it, and yes, command and arguments are already defined. 回答1: Why are you copying the token into command when you're parsing command ? It's a very unsafe thing to do. You can do: char *command_tok, *args_tok; command_tok = strtok(command, delimiter); args_tok = strtok(NULL,