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在 C 语言中调用 ChatGPT API，您需要使用 C 的网络编程库（例如 libcurl）发送 HTTP 请求。

以下是使用 libcurl 调用 ChatGPT API 的示例代码：

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

int main(void)
{
  CURL *curl;
  CURLcode res;
  char *url = "https://api.openai.com/v1/engines/davinci-codex/completions";
  char *apikey = "YOUR_API_SECRET_KEY";
  char *prompt = "Hello, how are you?";
  double temperature = 0.7;
  int max_tokens = 100;

  curl_global_init(CURL_GLOBAL_ALL);
  curl = curl_easy_init();
  if(curl) {
    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "Content-Type: application/json");
    char authorization[128];
    sprintf(authorization, "Authorization: Bearer %s", apikey);
    headers = curl_slist_append(headers, authorization);

    char data[256];
    sprintf(data, "{\"prompt\":\"%s\",\"temperature\":%lf,\"max_tokens\":%d}", prompt, temperature, max_tokens);

    curl_easy_setopt(curl, CURLOPT_URL, url);
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

    res = curl_easy_perform(curl);

    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));

    curl_easy_cleanup(curl);
  }
  curl_global_cleanup();

  return 0;
}