strtok

问题 Or rather, how does strtok produce the string to which it's return value points? Does it allocate memory dynamically? I am asking because I am not sure if I need to free the token in the following code: The STANDARD_INPUT variables is for exit procedure in case I run out of memory for allocation and the string is the tested subject. int ValidTotal(STANDARD_INPUT, char *str) { char *cutout = NULL, *temp, delim = '#'; int i = 0; //Checks the number of ladders in a string, 3 is the required

问题 #define DELIMS "!\"#$%&()|'*+,?/:;<=>@[\092]^_{}~\177" void getFileLine(FILE *fp) { char *word, *ptr; int tokennum, count; char buffer[100]; while(!feof(fp)) { (fgets(buffer, 100, fp)); ptr = buffer; for(tokennum = 1; word = strtok(ptr, DELIMS);ptr = NULL, tokennum++) { word = strtok(ptr, DELIMS); printf("%s\n", word); } } } So I am passing in a file that has a sample program in it. My job is to remove some delims and pass each word from the code into a tree. While I am not at the tree part

问题 int main (){ FILE *file = fopen ( "C:\\input.txt", "r" ); int i=0, j=0, k=0; char *result[10][10]; char line[100]; char *value; char *res[100][100]; for(i=0; i<=9; i++){ for(j=0;j<=9;j++){ result[i][j] = NULL; } } while(fgets(line, sizeof(line), file)){ char *array=strtok(line,"\n"); res[0][0]=strdup(array); printf("\n\n\n %s RES \n",res[0][0]); array=strtok(array,"\n"); res[0][1]=strdup(array); printf("\n\n\n %s RES \n",res[0][1]); array=strtok(line,"\n"); res[0][2]=strdup(array); } I want

问题 I am designing a c++ program, somewhere in the program i need to detect if there is a blank(empty token) next to the token used know eg. if(token1==start) { token2=strtok(NULL," "); if(token2==NULL) {LCCTR=0;} else {LCCTR=atoi(token2);} so in the previous peice token1 is pointing to start , and i want to check if there is anumber next to the start , so I used token2=strtok(NULL," ") to point to the next token but unfortunattly the strtok function cannot detect empty spaces so it gives me an

问题 This question already has answers here : How to get position of delimited separated string in C (2 answers) Closed 5 years ago . My text file look like: at:x:25:25:Batch jobs daemon:/var/spool/atjobs:/bin/bash avahi:x:109:111:User for Avahi:/var/run/avahi-daemon:/bin/false Now i want to get the position of tokens seperated by delimeters. like eg at-position 1, x--position 2, 25--position 3 and so on. Now my for loop is not working for(int i=0; i #include<stdio.h> #include<string.h> int main

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I'm trying to write a C program which creates a UNIX shell. In this shell when a UNIX command is typed, the shell should execute it in the foreground or background (background when & is specified). I'm getting the command to run in the foreground but I can't run it in the background. Here is my code: #include

问题 I am trying to split my actual key on dot and then extract all the fields after splitting it on dot. My key would look like something this - t26.example.1136580077.colox Below is the code I have which I was in the impression, it should work fine but after that I figured it out that it is for windows only and I am running my code on ubuntu and because of that reason I always get - error: âstrtok_sâ was not declared in this scope Below is my code if(key) { vector<string> res; char* p; char*

问题 I'm trying to read in a file with a couple hundred integers, some positive, some negative and store them in an array. They have to be read in as a string using strtok, though. I keep getting a segmentation fault and I'm not sure why. The count is to figure out how many total integers are in the file. /*Input file looks like this: 718321747 -1828022042 -1665405912 -175307986 -53757018 -1551069786 525902369 -1945908378 853648883 */ int main(int argc, char* argv[]) { char buffer[50]; char* token

问题 I am attempting to extract two columns of numbers from a text file. first column is the real part of the number and the second in the imaginary part. I managed to extract the list of numbers from the file as strings but I don't know how to separate the strings into two parts. I have attempted to use the sscanf function but just hasnt worked. The difficult part is the numbers can be both positive and negative therefore I cant use + and - in the delimiter of the strtok function since it will

问题 When trying to delete/free character ptr without being processed completely by strtok_r , its giving me stack trace error. I know that one cannot free/delete a strtok_r char ptr in a regular way, without completing the whole strings separation process by strtok_r func. Can anyone tell me how to free a char ptr, when its under process by strtok_r ? char *data = new char[temp->size()+1];//temp is of type string copy(temp->begin(),temp->end(),data); data[temp->size()]='\0'; count = 0; while