C 拆分字符串

Question

#include "stdio.h"
#include "string.h"
#include "stdlib.h"

char *strArray[40];

void parsing(char *string){
  int i = 0;
  char *token = strtok(string, " ");
  while(token != NULL)
  {
    strcpy(strArray[i], token);
    printf("[%s]\n", token);
    token = strtok(NULL, " ");
    i++;
  }
}

int main(int argc, char const *argv[]) {
char *command = "This is my best day ever";
parsing(command); //SPLIT WITH " " put them in an array - etc array[0] = This , array[3] = best

return 0;
}

这是我的代码，有什么简单的方法可以解决吗？顺便说一句，我的代码不起作用。我是 C 语言的新手，我不知道该如何处理:( 帮助

Answer 1

strtok() 实际上修改了提供的参数，因此您不能传递字符串文字并期望它起作用。

您需要有一个可修改的参数才能使其正常工作。

根据 man page

Be cautious when using these functions. If you do use them, note that:

These functions modify their first argument.

These functions cannot be used on constant strings.

FWIW，任何修改字符串文字的尝试都会调用 undefined behavior.

Answer 2

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *strArray[40];

void parsing(const char *string){//Original does not change
    int i = 0;
    strArray[i++] = strdup(string);//make copy to strArray[0]

    char *token = strtok(*strArray, " ");
    while(token != NULL && i < 40 - 1){
        strArray[i++] = token;
        //printf("[%s]\n", token);
        token = strtok(NULL, " ");
    }
    strArray[i] = NULL;//Sentinel

}

int main(void){
    char *command = "This is my best day ever";
    parsing(command);

    int i = 1;
    while(strArray[i]){
        printf("%s\n", strArray[i++]);
    }
    free(strArray[0]);
    return 0;
}

int parsing(char *string){//can be changed
    int i = 0;

    char *token = strtok(string, " ");
    while(token != NULL && i < 40){
        strArray[i] = malloc(strlen(token)+1);//Ensure a memory for storing
        strcpy(strArray[i], token);
        token = strtok(NULL, " ");
        i++;
    }
    return i;//return number of elements
}

int main(void){
    char command[] = "This is my best day ever";
    int n = parsing(command);

    for(int i = 0; i < n; ++i){
        printf("%s\n", strArray[i]);
        free(strArray[i]);
    }
    return 0;
}

Answer 3

在你们的帮助下我已经完成了，谢谢大家:)

是我的拆分库=https://goo.gl/27Ex6O

代码不是动态的，如果输入 100 位数字，我猜它会崩溃

我们可以使用带有这些参数的库：

正在解析（输出文件、输入文件、拆分字符）

谢谢

C 拆分字符串

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