Thread: curl problem

I am using the following code to fetch response from my server and i want to send dynamic values in URL. How can I send the dynamic values through URL?

Code:

#include <stdio.h>
#include <curl/curl.h>
#include <curl/easy.h>
#include <curl/types.h>



size_t write_data_balance_amt(void *buffer, size_t size, size_t nmemb, void *userp);

int main(char card_no[10],char PIN[4])
{
	
  CURL *curl;
  CURLcode res;
	card_no="123456789";
	PIN="1234";
	amount="1000";

  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1 ); /* DEBUG - for those who RTFM */
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data_balance_amt);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA,&PIN );
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &card_no);
    curl_easy_setopt(curl, CURLOPT_URL, (("http://192.168.100.74:8080/posserver/transaction?msgid=200&pin=")&PIN("&pname=deba&cardno=")&card_no("&cvv=111&amt=amount"));
    res = curl_easy_perform(curl); 
	    curl_easy_cleanup(curl);
  }
  
  return 0;
}

size_t write_data_balance_amt(void *buffer, size_t size, size_t nmemb, void *userp)
{
    char *response;
    response = (char*)buffer;
    /* NOT \0 terminated, so use the passed size information */
    printf("*********** %.*s\n",size*nmemb,response);
    //lk_dispclr();
    //lk_disptext(2,0,response,0);
    return size * nmemb; /* V.Important */
}