Re: [問題] fseek的問題

[rmp4aup6 (嘿嘿)]

不好意思直接貼上我寫的code好了，

int main()
{
        FILE *fptr, *fptr2;
        int i = 0, start;
        char string[MAX];
        char ch;

        fptr2 = fopen("new2.txt", "w+");
        if(!fptr2)
        {
                printf("open failed\n");
                exit(1);
        }

        // read user input data
        while((ch=getchar())!=ENTER && i < MAX)
        {
                string[i++] = ch;
        }

        // write user data into new1.txt
        fwrite(string, sizeof(char), i, fptr2);

        fseek(fptr2, -1, SEEK_CUR);
        printf("%d\n",(int)ftell(fptr2));
        printf("i = %d\n", i);
        int asd;
        asd = fseek(fptr2, -1, SEEK_CUR);
        printf("%d\n",(int)ftell(fptr2));
        printf("asd = %d\n", asd);
        int bytes;
        char string1[MAX];
        bytes = fread(string1, sizeof(char), MAX, fptr2);
        printf("total character = %d\n", bytes);
        if (bytes < MAX)
        {
                string[bytes] = '\0';
        }
        printf("string = %s\n", string);


        fclose(fptr2);
        return 0;
}

大致上是這樣，若input為hello，output就是為h。

但我原本以為會是o。

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