c - 读取文件时出现未知符号

Question

我读取文件，但在文件末尾我得到未知符号:

int main()
{
        char *buffer, ch;
        int i = 0, size;
        FILE *fp = fopen("file.txt", "r");
        if(!fp){
                printf("File not found!\n");
                exit(1);
        }
        fseek(fp, 0, SEEK_END);
        size = ftell(fp);
        printf("%d\n", size);
        fseek(fp, 0, SEEK_SET); 
        buffer = malloc(size * sizeof(*buffer));
        while(((ch = fgetc(fp)) != NULL) && (i <= size)){
                buffer[i++] = ch;
        }
        printf(buffer);
        fclose(fp);
        free(buffer);
        getch();
        return 0;
}

Answer 1

在打印之前，您需要在缓冲区末尾添加一个 null 字符:

while(((ch = fgetc(fp)) != NULL) && (i <= size)){
    buffer[i++] = ch;
}
buffer[i] = 0; // add a null char at the end.
printf("%s",buffer); // print using %s format specifier.