在C中搜索.csv文件 [英] Search in a .csv file in C

问题描述

我正在用C做一个项目，我需要在其中搜索.csv文件.但是，程序中存在一些错误，我找不到它们.独立于我输入的城市(文件中存在)，唯一出现的是"ERROR". 有谁可以帮助我吗?谢谢！ (对不起，我的英语不是我的母语……)

I'm doing a project in C, in which I need to search in a .csv file. However, there are some mistakes in the program, and I can't find them. Independently of the city I enter (existing in the file), the only thing that appears is "ERROR". Can someone help me, please? Thanks! (Sorry for my English, it isn't my first language...)

int search_date(){
char tem_max[10];
char tem_min[10];
char humidity[10];
char pressure[10];
char town[100];
char city[100];
int i=0;

printf("Enter the name of the town: ");    
scanf ("%[^\n]%*c", town);

FILE *stream = fopen("cities2.csv", "r");

char line[1024];
    while (fgets(line, 1024, stream))
    {
        char *tmp = strdup(line);
        if (i > 0) {
            strcpy(city, strtok(tmp, ",\n"));  
            strcpy(tem_max, strtok(NULL, ","));  
            strcpy(tem_min, strtok(NULL, ","));
            strcpy(humidity, strtok(NULL, ","));
            strcpy(pressure, strtok(NULL, ","));

            if (strcmp(city, town) == 0)
            {
                printf("Town - Maximum temperature - Minimum temperature - Humidity - Pressure\n");
                printf("%s - %s - %s - %s - %s\n",city, tem_max, tem_min, humidity, pressure);
            }
        i++;      
        free(tmp);
        }
        else
        {
            printf("ERROR");
        }
    fclose(stream);
}

}

推荐答案

您好，Stephen Docy是正确的.他已经指出了你的错误.我刚刚修改了您的代码，以使其适合您.

Hi Stephen Docy is right. Already he pointed out your mistake. I have just modified your code so that it should work for you.

int search_date(){
   char tem_max[10];
   char tem_min[10];
   char humidity[10];
   char pressure[10];
   char town[100];
   char city[100];
   int i=1;                                             // <--- now i is 1

   printf("Enter the name of the town: ");    
   scanf ("%[^\n]%*c", town);

   FILE *stream = fopen("cities2.csv", "r");

   char line[1024];
   while (fgets(line, 1024, stream))
   {
       char *tmp = strdup(line);
       if (i > 0) {                                // <--- i is now > 0
        strcpy(city, strtok(tmp, ",\n"));  
        strcpy(tem_max, strtok(NULL, ","));  
        strcpy(tem_min, strtok(NULL, ","));
        strcpy(humidity, strtok(NULL, ","));
        strcpy(pressure, strtok(NULL, ","));

        if (strcmp(city, town) == 0)
        {
            printf("Town - Maximum temperature - Minimum temperature - Humidity - Pressure\n");
            printf("%s - %s - %s - %s - %s\n",city, tem_max, tem_min, humidity, pressure);
        }
      i++;                                      // <--- now you do i++
      free(tmp);
    }
    else
    {
        printf("ERROR");
    }
  fclose(stream);
}

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