strtok

问题 char line[255]; char *token = NULL; char *line2 = NULL; char *temporaryToken = NULL; if( scanf(" %[^\n]", line) > 0) token = strtok( line, ";" ); //divide the line by ; do { line2 = token; temporaryToken = strtok(line2, " "); do { //divide the line2 by spaces into command and args, not the question here] temporaryToken = strtok( NULL, " " ); }while (temporaryToken != NULL ); token = strtok( NULL, ";" ); }while(token != NULL); this is not my code verbatim, by the way, just an example of how it

问题 New in C and pretty confused about how to deal with several strings at the same time using strtok, for a simply example, I want to use strtok to extract the number and compare then. #include <stdio.h> #include <string.h> int main() { char s1[100]="11.54"; char s2[100]="12.55"; const char tok[2]="."; char* token1=strtok(s1,tok); char* token2=strtok(s2,tok); while(token1 !=NULL && token2 !=NULL){ int temp=strcmp(token1,token2); if(temp==0){ token1=strtok(NULL,tok); token2=strtok(NULL,tok); }

问题 New in C and pretty confused about how to deal with several strings at the same time using strtok, for a simply example, I want to use strtok to extract the number and compare then. #include <stdio.h> #include <string.h> int main() { char s1[100]="11.54"; char s2[100]="12.55"; const char tok[2]="."; char* token1=strtok(s1,tok); char* token2=strtok(s2,tok); while(token1 !=NULL && token2 !=NULL){ int temp=strcmp(token1,token2); if(temp==0){ token1=strtok(NULL,tok); token2=strtok(NULL,tok); }

问题 I am using strtok() function to split a string into Tokens.The problem is when there are 2 delimiters in row. /* strtok example */ #include <stdio.h> #include <string.h> int main () { char str[] ="Test= 0.28,0.0,1,,1.9,2.2,1.0,,8,4,,,42,,"; char * pch; printf ("Splitting string \"%s\" into tokens:\n",str); pch = strtok (str,", "); while (pch != NULL) { printf ("Token = %s\n",pch); pch = strtok (NULL, ", "); } return 0; } And outputs: Splitting string "Test= 0.28,0.0,1,,1.9,2.2,1.0,,8,4,,,42,,

问题 I'm having trouble with a fairly basic bit of code. I need to read each line from the file shown below, split it up into the 3 parts with strtok, and store each part into an array. The arrays for "goals" and "assists" are working perfectly, but for some reason the entire name array is filled with the last name read from the file. Input file: Redden 2 0 Berglund 5 2 Jackman 2 0 Stewart 4 0 Oshie 3 5 McDonald 2 4 Pietrangelo 2 7 Perron 2 6 Tarasenko 5 5 Relevant code: int main(int argc, char*

问题 I am using strtok(...) of the library and it appears to be working fine until the end condition, where it results in a segmentation fault and program crash. The API claims that strtok(...) will output a NULL when there are no more tokens to be found, which meant, I thought, that you had to catch this NULL in order to terminate any loops that you were running using strtok(...). What do I need to do to catch this NULL to prevent my program from crashing? I imagined the NULL was allowed for use

问题 Why do we use null in strok() function? while(h!=NULL) { h=strtok(NULL,delim); if(hold!=NULL) printf("%s",hold); } What does this program do when *h is pointing to a string? 回答1: strtok is part of the C library and what it does is splitting a C null-delimited string into tokens separated by any delimiter you specify. The first call to strtok must pass the C string to tokenize, and subsequent calls must specify NULL as the first argument, which tells the function to continue tokenizing the

问题 I'm writing a C program to study the usage of function strtok() . Here is my code: #include <stdio.h> #include <string.h> main() { char abc[100] = "ls &"; char *tok; tok = strtok(abc, " "); while (tok != NULL) { printf("%s", tok); tok = strtok(NULL, " "); } printf("\n\n\n\n\n%s", tok); return 0; } It is printing the following output: ls& (null) But I want it to print & at the second printf statement. How do I do it? I need this part for my homework project. 回答1: Make sure you can identify the

问题 Ok, so I understand that strtok modifies its input argument, but in this case, it's collapsing down the input string into only the first token. Why is this happening, and what can I do to fix it? (Please note, I'm not talking about the variable "temp", which should be the first token, but rather the variable "input", which after one call to strtok becomes "this") #include <string.h> #include <stdlib.h> #include <stdio.h> int main(int argc, char* argv[]) { char input[]="this is a test of the

问题 How can I use strtok_r instead of strtok to do this? char *pchE = strtok(NULL, " "); Now I'm trying to use strtok_r properly... But sometimes I get problems with the strtol . I have a thread that I execute 10 times (at the same time). char *savedEndd1; char *nomeClass = strtok_r(lineClasses, " ", &savedEndd1); char *readLessonS = strtok_r (NULL, " ", &savedEndd1); char *readNTurma = strtok_r(NULL, " ", &savedEndd1); if (readNTurma==NULL) printf("CLASS STRTOL begin %s %s\n",nomeClass,