JSON是一種輕量級的數(shù)據(jù)交換格式，它在互聯(lián)網(wǎng)應(yīng)用中被廣泛使用。在C編程語言中，我們可以通過第三方JSON庫來解析和生成JSON數(shù)據(jù)。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jansson.h>
int main()
{
char *json_string = "{\"name\":\"Tom\",\"age\":20,\"score\":{\"chinese\":90,\"math\":80,\"english\":85}}";
json_t *json;
json_error_t error;
json = json_loads(json_string, 0, &error);
if (!json) {
fprintf(stderr, "Error parse json: %s\n", error.text);
return EXIT_FAILURE;
}
const char *name = json_string_value(json_object_get(json, "name"));
int age = json_integer_value(json_object_get(json, "age"));
printf("name: %s, age: %d\n", name, age);
json_t *score = json_object_get(json, "score");
int chinese = json_integer_value(json_object_get(score, "chinese"));
int math = json_integer_value(json_object_get(score, "math"));
int english = json_integer_value(json_object_get(score, "english"));
printf("chinese: %d, math: %d, english: %d\n", chinese, math, english);
json_decref(json);
return EXIT_SUCCESS;
}

上面的代碼演示了如何使用json_loads函數(shù)將JSON字符串解析為一個json_t對象，并根據(jù)Key值獲取對應(yīng)的Value值。

除了解析JSON數(shù)據(jù)，我們也可以通過JSON庫來生成JSON數(shù)據(jù)：

json_t *root, *score_obj;
root = json_object();
json_object_set_new(root, "name", json_string("Tom"));
json_object_set_new(root, "age", json_integer(20));
score_obj = json_object();
json_object_set_new(score_obj, "chinese", json_integer(90));
json_object_set_new(score_obj, "math", json_integer(80));
json_object_set_new(score_obj, "english", json_integer(85));
json_object_set(root, "score", score_obj);
char *json_string = json_dumps(root, JSON_INDENT(4));
printf("%s", json_string);
json_decref(score_obj);
json_decref(root);
free(json_string);

上面的代碼創(chuàng)建了一個json_t對象，根據(jù)Key值分別添加不同類型的Value值，并調(diào)用json_dumps函數(shù)將該JSON數(shù)據(jù)轉(zhuǎn)換成JSON格式的字符串。