strtok | 易学教程

Cannot concatenate strtok's output variable. strcat and strtok

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问题 I’ve spent hours on this program and have put several hours online searching for alternatives to my methods and have been plagued with crashes and errors all evening… I have a few things I'd like to achieve with this code. First I’ll explain my problems, then I’ll post the code and finally I’ll explain my need for the program. The program outputs just the single words and the concatenate function does nothing. This seems like it should be simple enough to fix... My first problem is that I

Parallel to PHP's “explode” in C: Split char* into char* using delimiter [duplicate]

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This question already has answers here : Closed 7 years ago . Possible Duplicate: Split string with delimiters in C I'm searching a good way to "explode" a char* into other char* using a delimiter. My delimiter will be # You can use strtok like CrazyCasta said but his/hers code is wrong. char *tok; char *src = malloc(strlen(srcStr) + 1); memcpy(src, srcStr); tok = strtok(src, "#"); if(tok == NULL) { printf("no tokens found"); free(src); return ???; } printf("%s ; ", tok); while((tok = strtok(NULL, "#"))) printf("%s ; ", tok); printf("\n"); free(str); Be aware that strtok has to be called the

Complex algorithm to extract numbers/number range from a string

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问题 I am working on a algorithm where I am trying the following output: Given values/Inputs: char *Var = "1-5,10,12,15-16,25-35,67,69,99-105"; int size = 29; Here "1-5" depicts a range value, i.e. it will be understood as "1,2,3,4,5" while the values with just "," are individual values. I was writing an algorithm where end output should be such that it will give complete range of output as: int list[]=1,2,3,4,5,10,12,15,16,25,26,27,28,29,30,31,32,33,34,35,67,69,99,100,101,102,103,104,105; If

strtok()

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描述 C 库函数 char *strtok(char *str, const char *delim) 分解字符串 str 为一组字符串， delim 为分隔符。声明下面是 strtok() 函数的声明。 char *strtok(char *str, const char *delim) 参数 str -- 要被分解成一组小字符串的字符串。 delim -- 包含分隔符的 C 字符串。返回值该函数返回被分解的第一个子字符串，如果没有可检索的字符串，则返回一个空指针。实例下面的实例演示了 strtok() 函数的用法。 #include <string.h> #include <stdio.h> int main () { char str[80] = "This is - www.runoob.com - website"; const char s[2] = "-"; char *token; /* 获取第一个子字符串 */ token = strtok(str, s); /* 继续获取其他的子字符串 */ while( token != NULL ) { printf( "%s\n", token ); token = strtok(NULL, s); } return(0); } 参考资料：菜鸟教程来源： https://www.cnblogs.com

Why does the following C program give a bus error?

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问题 I think it's the very first strtok call that's failing. It's been a while since I've written C and I'm at a loss. Thanks very much. #include <stdio.h> #include <string.h> int main(int argc, char **argv) { char *str = "one|two|three"; char *tok = strtok(str, "|"); while (tok != NULL) { printf("%s\n", tok); tok = strtok(NULL, "|"); } return 0; } 回答1: String literals should be assigned to a const char*, as modifying them is undefined behaviour. I'm pretty sure that strtok modifies it's argument,

c++ tokenize std string [duplicate]

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问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How do I tokenize a string in C++? Hello I was wondering how I would tokenize a std string with strtok string line = "hello, world, bye"; char * pch = strtok(line.c_str(),","); I get the following error error: invalid conversion from ‘const char*’ to ‘char*’ error: initializing argument 1 of ‘char* strtok(char*, const char*)’ I'm looking for a quick and easy approach to this as I don't think it requires much

developed a strtok alternative

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I have developed my own version of strtok. Just to practice the use of pointers. Can anyone see any limitations with this or anyway I can improve. void stvstrtok(const char *source, char *dest, const char token) { /* Search for the token. */ int i = 0; while(*source) { *dest++ = *source++; if(*source == token) { source++; } } *dest++ = '\0'; } int main(void) { char *long_name = "dog,sat ,on ,the,rug,in ,front,of,the,fire"; char buffer[sizeof(long_name)/sizeof(*long_name)]; stvstrtok(long_name, buffer, ','); printf("buffer: %s\n", buffer); getchar(); return 0; } A side note: The word 'token' is

strtok - how avoid new line to and put to array of strings?

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问题 if i dupe topic i really sorry, i searched for it with no result here. I have code void split(char* str, char* splitstr) { char* p; char splitbuf[32]; int i=0; p = strtok(str,","); while(p!= NULL) { printf("%s", p); sprintf(&splitstr[i],"%s",p); i++; p = strtok (NULL, ","); } } How can i use proper sprintf to put the splited words by strtok to string array? Can i somehow avoid breaklines created by strtok? I am programming in ANSI C. I declared array splitstr and str the same way. char*

How to use strtok in C properly so there is no memory leak?

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I am somewhat confused by what happens when you call strtok on a char pointer in C. I know that it modifies the contents of the string, so if I call strtok on a variable named 'line', its content will change. Assume I follow the bellow approach: void function myFunc(char* line) { // get a pointer to the original memory block char* garbageLine = line; // Do some work // Call strtok on 'line' multiple times until it returns NULL // Do more work free(garbageLine); } Further assume that 'line' is malloced before it is passed to myFunc. Am I supposed to free the original string after using strtok

Complex algorithm to extract numbers/number range from a string

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I am working on a algorithm where I am trying the following output: Given values/Inputs: char *Var = "1-5,10,12,15-16,25-35,67,69,99-105"; int size = 29; Here "1-5" depicts a range value, i.e. it will be understood as "1,2,3,4,5" while the values with just "," are individual values. I was writing an algorithm where end output should be such that it will give complete range of output as: int list[]=1,2,3,4,5,10,12,15,16,25,26,27,28,29,30,31,32,33,34,35,67,69,99,100,101,102,103,104,105; If anyone is familiar with this issue then the help would be really appreciated. Thanks in advance! My initial