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read csv file in c

Nice Narwhal answered on December 6, 2020 Popularity 8/10 Helpfulness 2/10

answer read csv file in c

read csv file in c

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/*Sample CSV File*/
/*header: id,host_id,minimum_nights,number_of_reviews,calculated_host_listings_count,availability_365
*/

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

#define LINESIZE 1024

struct listing{
	int id, host_id, minimum_nights, number_of_reviews, calculated_host_listings_count,
    availability_365;
    char *host_name, *neighbourhood_group, *neighbourhood, *room_type;
    float latitude, longitude, price;
    };
    
    struct listing getfields(char *line){
    struct listing item;
    
    item.id = atoi(strtok(line, ","));
    item.host_id = atoi(strtok(NULL, ","));
    item.host_name = strdup(strtok(NULL, ","));
    item.neighbourhood_group = strdup(strtok(NULL, ","));
    item.neighbourhood = strdup(strtok(NULL,","));
    item.latitude = atof(strtok(NULL, ","));
    item.longitude = atof(strtok(NULL, ","));
    item.room_type = strdup(strtok(NULL,","));
    item.price = atof(strtok(NULL, ","));
    item.minimum_nights = atoi(strtok(NULL, ","));
    item.number_of_reviews = atoi(strtok(NULL, ","));
    item.calculated_host_listings_count = atoi(strtok(NULL, ","));
    item.availability_365 = atoi(strtok(NULL, ","));
    
    return item;
    
}
   void displayStruct(struct listing item){
   		printf("ID: %d\n" item.id);
   		printf("Host ID: %d\n", item.host_id);
   }
   
   int main(int argc, char* args[]) {
       struct listing list_items[22445];
       char line[LINESIZE];
       int i, count;

       FILE *fptr = fopen("listings.csv", "r");
       if (fptr == NULL){
          printf("Error reading input file listings.csv\n");
          exit(-1);
    	}
    
        count = 0;

        while (fgets(line, LINESIZE, fptr) != NULL){
        list_items[count++] = getfields(line);
        }
        fclose(fptr);
        // Display items
        for(i = 0; i<count; i++)
            displayStruct(list_items[i]);

         return 0;
     
     }

Popularity 8/10 Helpfulness 2/10 Language c

Source: Grepper

Tags: c csv file whatever

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Contributed on Sep 22 2023

Nice Narwhal

0 Answers Avg Quality 2/10

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

const char* getfield(char* line, int num)
{
    const char* tok;
    for (tok = strtok(line, ";");
            tok && *tok;
            tok = strtok(NULL, ";\n"))
    {
        if (!--num)
            return tok;
    }
    return NULL;
}

int main()
{
    FILE* stream = fopen("input", "r");

    char line[1024];
    while (fgets(line, 1024, stream))
    {
        char* tmp = strdup(line);
        printf("Field 3 would be %s\n", getfield(tmp, 3));
        // NOTE strtok clobbers tmp
        free(tmp);
    }
}

Popularity 10/10 Helpfulness 4/10 Language c

Source: stackoverflow.com

Tags: c

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Contributed on Dec 06 2020

chfle

0 Answers Avg Quality 2/10

read csv file in c

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