如何在C中计算一个文件中的行数？

FILE *file = fopen("filename.txt", "r");

char buffer[256]; // 用于存储每行内容的缓冲区
int lineCount = 0; // 行数计数器

while (fgets(buffer, sizeof(buffer), file) != NULL) {
  lineCount++;
}

fclose(file);

#include <stdio.h>

int main() {
    FILE *file = fopen("filename.txt", "r");
    if (file == NULL) {
        printf("文件打开失败\n");
        return 1;
    }
    
    char buffer[256];
    int lineCount = 0;

    while (fgets(buffer, sizeof(buffer), file) != NULL) {
        lineCount++;
    }
    
    printf("文件中的行数：%d\n", lineCount);
    
    fclose(file);
    
    return 0;
}