将char数组中的指针分配给字符串C中的每个单词

Question

I have a array of chars that is a maximum of 200 characters. I would like to assign an array of points to each word in the array. I have this picture as an example of what is supposed to happen. I am not allowed to post images so here is a link to the picture on imgur

I have tried looping over the string looking for white spaces, assigning a new pointer to each occurrence. But then it prints the remaining string each time and then crashes.

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

int main()
{
    char str[200];
    char *arr[200];
    fgets(str, 200, stdin);
    arr[1] = &str[5];
    printf("%s", arr[1]);
    int i = 0;
    int next = 0;
    char ch = ' ';
    for (; i < 200; i++) {
        ch = str[i];
        if (ch == ' '){
            arr[next] = &str[i];
            next++;
        }
    }
    i = 0;
    for (; i < 200; i++) {
        printf("%s", arr[i]);
    }
    return 0;
}

Answer 1

如果内容中的空白少于200个，则输出循环将从arr [i]抓取一个指向随机地址的指针，并将其提供给printf ...这可能会导致崩溃。

Answer 2

sample to fix.

#include <stdio.h>

int main() {
    char str[200];
    char *arr[sizeof(str)/2];//Enough if half
    fgets(str, sizeof(str), stdin);
    int i, j;
    char ch = ' ';
    for (j = i = 0; str[i] && str[i] != '\n'; i++) {//i < 200 is over run.
        if(ch == ' ' && str[i] != ' ')
            arr[j++] = &str[i];
        ch = str[i];
    }
    for (i = 0; i < j; i++) {//i < 200 is over run.
        printf("%s", arr[i]);
    }
    return 0;
}

---

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

int main() {
    char str[200];
    char *arr[sizeof(str)/2];
    fgets(str, sizeof(str), stdin);
    int i, j=0;
    char *word = strtok(str, " \t\n");
    while(word){
        arr[j++] = word;
        word = strtok(NULL, " \t\n");
    }
    for (i = 0; i < j; i++) {
        printf("%s\n", arr[i]);
    }
    return 0;
}

Answer 3

You have two options:

1) if the string is modifyable you can change the first whitespace character after each word to '\\0'. This will let you print using the pointers you store, but the original string won't print properly anymore.

2) store the length of the string and the pointer in a struct, and have a custom function the can print them for you.