c - 如何修复警告：C 中指针和整数之间的比较

问题描述

因此，对于我的C代码，我正在编写一个二叉搜索树，它接收一个名为 node 的 typedef 结构，该结构具有 char* 名称和 char* 电话。我在这段代码中所做的是，我把它放在一个二叉搜索树中，并按字母顺序输出列表，旁边是 phoneNum。它有效，但我得到了错误

警告：指针和整数之间的比较

我该怎么做才能解决这个问题？

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <stdbool.h> 
#include <string.h>
#include <malloc.h>
#define MAX 10

char* nameArray[] = {"George", "Zoey", "Hannah", "David", "Avery",
        "Justin", "Sasha", "Babara", "Steve", "Garnett", NULL};
char* number[] = {"610-11-1212", "508-123-1000", "617-555-1212",
        "818-919-8100", "710-777-1170", "310-333-1300", "510-555-1001","333-310-3201", "445-440-0044", "220-210-2210", NULL};
int flag;
typedef struct node
{

    char* name;
    char* phoneNum;
    struct node * left;
    struct node * right;
} node_t;


//int compareStrings(char* str1, char* str2){return (strcmp(str1, str2));}


void insert(node_t * tree, char* name, char* phoneNum);
void print_tree_inorder(node_t * current);
s
int main()
{
    int sum = 0;
    node_t * test_list = malloc(sizeof(node_t));

    /* set values explicitly, alternative would be calloc() */
    test_list->name =  "";
    test_list->phoneNum = "";
    test_list->left = NULL;
    test_list->right = NULL;


         for(int i = 0; i<MAX; i++){
            insert(test_list,nameArray[i],number[i] );
        }

    printf("\n In order\n");
    print_tree_inorder(test_list);
}

void insert(node_t * tree, char* name, char* phoneNum)
{  

    if (tree->name == 0)
    {
        /* insert on current (empty) position */
        tree->name = name;
        tree->phoneNum = phoneNum;
    }
    else
    {

        if ( strcmp(tree->name, name) < tree->name) //here
        {
            /* insert left */
            if (tree->left != NULL)
            {
                insert(tree->left, name, phoneNum);
            }
            else /* no left nodes*/
            {
                tree->left = malloc(sizeof(node_t));
                /* set values explicitly, alternative would be calloc() */
                tree->left->name = name;
                tree->left->phoneNum = phoneNum;
                tree->left->left = NULL;
                tree->left->right = NULL;
            }
        }
        else /*add node to right */
        {
            if ( strcmp(tree->name, name) >= tree->name) //here
            {
                /* insert right */
                if (tree->right != NULL)
                {
                    insert(tree->right, name, phoneNum);
                }
                else
                {
                    tree->right = malloc(sizeof(node_t));
                    /* set values explicitly, alternative would be calloc() */
                    tree->right->name = name;
                    tree->right->phoneNum = phoneNum;
                    tree->right->left = NULL;
                    tree->right->right = NULL;
                }
            }
        }
    }

}

void print_tree_inorder(node_t * current) {
    if (current == NULL) return;
    print_tree_inorder(current->left);
    printf(" %s  %s\n", current->name, current->phoneNum);
    print_tree_inorder(current->right);
}

标签： c

c - 如何修复警告：C 中指针和整数之间的比较

问题描述

解决方案

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