Merge Dictionaries in C: Complete Guide

In C programming, to achieve dictionary merging, you can use structures and linked lists to store and manipulate key-value pairs in the dictionary.

First, define a struct to represent key-value pairs in a dictionary.

typedef struct {
    char* key;
    char* value;
} KeyValuePair;

Next, define a linked list structure to store multiple key-value pairs.

typedef struct Node {
    KeyValuePair data;
    struct Node* next;
} Node;

Next, create a function to merge two dictionaries.

Node* mergeDict(Node* dict1, Node* dict2) {
    if (dict1 == NULL) {
        return dict2;
    }
    if (dict2 == NULL) {
        return dict1;
    }
    
    Node* merged = dict1;
    Node* current = merged;
    
    while (current->next != NULL) {
        current = current->next;
    }
    
    current->next = dict2;
    
    return merged;
}

Finally, you can use the following code to test the merge function.

int main() {
    Node* dict1 = NULL;
    Node* dict2 = NULL;
    
    // 添加字典1的键值对
    dict1 = addToDict(dict1, "key1", "value1");
    dict1 = addToDict(dict1, "key2", "value2");
    
    // 添加字典2的键值对
    dict2 = addToDict(dict2, "key3", "value3");
    dict2 = addToDict(dict2, "key4", "value4");
    
    // 合并字典
    Node* mergedDict = mergeDict(dict1, dict2);
    
    // 打印合并后的字典
    printDict(mergedDict);
    
    return 0;
}

Please note that the functions addToDict and printDict in the above code need to be implemented according to the specific situation, for adding key-value pairs to the dictionary and printing the contents of the dictionary.