从文本文件中读取行，打印其中的40行，然后“必须”使用系统调用lseek或fseek来更改偏移量？

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

#define MAX_LINE_LENGTH 256

void printLinesFromFile(const char* filename, int startLine, int numLines) {
    FILE* file = fopen(filename, "r");
    if (file == NULL) {
        printf("Failed to open file.\n");
        return;
    }

    // 设置起始位置
    fseek(file, 0, SEEK_SET);
    for (int i = 0; i < startLine; i++) {
        char line[MAX_LINE_LENGTH];
        if (fgets(line, MAX_LINE_LENGTH, file) == NULL) {
            printf("Failed to read line.\n");
            break;
        }
    }

    // 读取并打印行
    for (int i = 0; i < numLines; i++) {
        char line[MAX_LINE_LENGTH];
        if (fgets(line, MAX_LINE_LENGTH, file) == NULL) {
            printf("Failed to read line.\n");
            break;
        }
        printf("%s", line);

        // 更改偏移量
        fseek(file, 0, SEEK_CUR);
    }

    fclose(file);
}

int main() {
    const char* filename = "example.txt";
    int startLine = 0;
    int numLines = 40;

    printLinesFromFile(filename, startLine, numLines);

    return 0;
}