小程序 - 去字符串空格/二叉树查找

/*
 * Remove all the white spaces from a string.
 */
void removeWB(char* str)
{
    char* p;

    for (p = str; *str; str++)
        if (*str != ‘ ‘)
            *p++ = *str;
    *p = ‘\0‘;
}

#include <stdio.h>

typedef struct Node {
    int val;
    struct Node *left, *right;
} Node;

typedef enum {FOUND, NOT_FOUND} EXISTS;

EXISTS exists(Node *root, int target) 
{
    if (!root)
        return NOT_FOUND;
    if (root->val == target)
        return FOUND;
    return (target < root->val)
        ? exists(root->left, target)
        : exists(root->right, target);
}