如何使用 fscanf 读取包含多个单词的文本文件并通过索引将它们存储到字符串数组中

Question

The wordlist.txt is including like:

able
army
bird
boring
sing
song

And I want to use fscanf() to read this txt file line by line and store them into a string array by indexed every word like this:

src = [able army bird boring sing song]

where src[0]= "able", src[1] = "army" and so on. But my code only outputs src[0] = "a", src[1] = "b"... Could someone help me figure out what's going wrong in my code:

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

int main(int argc, char *argv[])
{
    FILE *fp = fopen("wordlist.txt", "r");
    if (fp == NULL)
    {
        printf("%s", "File open error");
        return 0;
    }
    char src[1000];
    for (int i = 0; i < sizeof(src); i++)
    {
        fscanf(fp, "%[^EOF]", &src[i]);
    }
    fclose(fp);
    printf("%c", src[0]);
    getchar();
    return 0;
}

Pretty appreciated!

Answer 1

For example like this.

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

#define MAX_ARRAY_SIZE 1000
#define MAX_STRING_SIZE 100

int main(int argc, char *argv[]) {
    FILE *fp = fopen("wordlist.txt", "r");
    if (fp == NULL) {
        printf("File open error\n");
        return 1;
    }
    char arr[MAX_ARRAY_SIZE][MAX_STRING_SIZE];
    int index = 0;
    while (1) {
        int ret = fscanf(fp, "%s", arr[index]);
        if (ret == EOF) break;
        ++index;
        if (index == MAX_ARRAY_SIZE) break;
    }
    fclose(fp);
    for (int i = 0; i < index; ++i) {
        printf("%s\n", arr[i]);
    }
    getchar();
    return 0;
}

Some notes:

• If there is an error, it is better to return 1 and not 0, for 0 means successful execution.
• For a char array, you use a pointer. For a string array, you use a double pointer. A bit tricky to get used to them, but they are handy.
• Also, a check of the return value of the fscanf would be great.
• For fixed size arrays, it is useful to define the sizes using #define so that it is easier to change later if you use it multiple times in the code.

Answer 2

It's reading file one character at a time, Which itself is 4 in size like we see sizeof('a') in word able. Same goes for 'b' and so on. So one approach you can use is to keep checking when there is a space or newline character so that we can save the data before these two things as a word and then combine these small arrays by adding spaces in between and concatenating them to get a single array.