上星期写了一个链表，写的很艰难，跌跌绊绊。昨天我又试着写了一个单词树。这次顺手多了，没遇到什么问题，非常顺利，我也放弃了自定义结构体类型的写法。将每一处结构体都用struct 写。
可能代码不是非常简洁高效，但是，目前测试功能正常。以后我会慢慢改进学习的。下面是完整代码。我准备放到我的期末作业里面用。
小愉悦，昨天晚上写着太高兴，半夜又爬起来修复了几个bug，今早测试，“完美！"
各项测试正常。。。。开心，这样也不枉我数学挂科了。。。。
#include <stdio.h> #include <stdlib.h> #include <dos.h> #include <stdbool.h> #include <string.h> #include <windows.h> #define EnterAndCheck while ( ( (c = getchar() ) == ' ') && c != '\n' ) int samewords; enum dowhat {delete = 1 ,add,search}; struct wtree* word_tree_insert(char *str,char *exp,struct wtree *pt); struct wtree* word_tree_search(char *str,struct wtree *pt); bool word_tree_delete(char *str,struct wtree *pt); bool word_tree_child_enum(struct wtree* pt); int alpcompare(const char a,const char b); struct wtree* creatchild(); struct wtree { char c; char exp[201]; bool self; struct wtree *child[45]; }; struct wtree defstr = {'0',{'\0'},FALSE,NULL} ; struct wtree root = {'0',{'\0'},FALSE,NULL}; int main() { int i =0; struct wtree root; root = defstr; char ch[100]; char exp[200]; while (i<4) { scanf("%s",ch); scanf("%s",exp); exchange(ch); struct wtree *ptemp = word_tree_insert(ch,exp,&root); printf("%c,%s\n",ptemp->c,ptemp->exp); i++; } char sear[20]; while (i<8) { printf("\n SEARCH\n"); scanf("%s",sear); char in[20]; strcpy(in,sear); exchange(in); struct wtree* py = word_tree_search(in,&root); if(py != NULL) { printf("\nword:%s\nexp:%s\n",sear,py->exp); } else { printf("\nno found!\n"); } i++; } while (i<10) { printf("\ndelete\n"); scanf("%s",sear); exchange(sear); word_tree_delete(sear,&root); i++; } while(i < 13) { printf("\n SEARCH\n"); scanf("%s",sear); char in[20]; strcpy(in,sear); exchange(in); struct wtree* py = word_tree_search(in,&root); if(py != NULL) { printf("\nword:%s\nexp:%s\n",sear,py->exp); } else { printf("\nno found!\n"); } } ;} bool word_tree_delete(char *str,struct wtree *pt) { int len = strlen(str); int i = 0; while (1) { if (pt->child[i] == NULL) { return FALSE; } else if(alpcompare((pt->child[i])->c,str[len - 1]) < 0) /**** a < b **/ { i++; continue; } else if (alpcompare((pt->child[i])->c,str[len - 1]) == 0) { str[len - 1] = '\0'; if (len == 1) { if ((pt->child[i])->self == TRUE) { (pt->child[i])->self = NULL; (pt->child[i])->exp[0] = '\0'; } break; } else { word_tree_delete(str,pt->child[i]); break; } } else if (alpcompare((pt->child[i])->c,str[len - 1]) > 0) { return FALSE; } } if (!word_tree_child_enum(pt->child[i])) /****无用节点删除 ***/ { int templen1 = strlen(pt->child); for (free(pt->child[i]);i < templen1 - 2;i++) { pt->child[i] = pt->child[i + 1]; } pt->child[templen1 - 1] = NULL; } return TRUE; } bool word_tree_child_enum(struct wtree* pt) { int i; int len = strlen(pt->child); if (len == 0) { return FALSE; } else { for (i = 0;i < len;i++) { if (pt->child[i] != NULL) { return TRUE; } } return FALSE; } } struct wtree* word_tree_search(char *str,struct wtree *pt) { int len = strlen(str); int i = 0; while (1) { if (pt->child[i] == NULL) { return NULL; } else if (alpcompare((pt->child[i])->c,str[len - 1]) < 0) /**** a < b **/ { i++; continue; } else if (alpcompare((pt->child[i])->c,str[len - 1]) == 0) { str[len - 1] = '\0'; if (len == 1) { return (pt->child[i]); } else { return word_tree_search(str,pt->child[i]); } } else if (alpcompare((pt->child[i])->c,str[len - 1]) > 0) { return NULL; } } } struct wtree* word_tree_insert(char *str,char *exp,struct wtree *pt) { int len = strlen(str); int i = 0; while (1) { if (pt->child[i] == NULL) { pt->child[i] = creatchild(); *(pt->child[i]) = defstr; (pt->child[i])->c = str[len - 1]; str[len - 1] = '\0'; if (len == 1) { strcpy((pt->child[i])->exp,exp); (pt->child[i])->self = TRUE; printf("return %p",pt->child[i]); return (pt->child[i]); } else { return word_tree_insert(str,exp,pt->child[i]); } } else if (alpcompare((pt->child[i])->c,str[len - 1]) < 0) /**** a < b **/ { i++; continue; } else if (alpcompare((pt->child[i])->c,str[len - 1]) == 0) { str[len - 1] = '\0'; if (len == 1) { samewords++; strcpy((pt->child[i])->exp,exp); (pt->child[i])->self = TRUE; return (pt->child[i]); } else { return word_tree_insert(str,exp,pt->child[i]); } } else if (alpcompare((pt->child[i])->c,str[len - 1]) > 0) { int tempint; int templen = strlen(pt->child); for (tempint = templen - 1; tempint > i;tempint--) { pt->child[tempint] = pt->child[tempint - 1]; } pt->child[i] = creatchild(); (pt->child[i])->c = str[len - 1]; str[len - 1] = '\0'; if (len == 1) { strcpy((pt->child[i])->exp,exp); (pt->child[i])->self = TRUE; return (pt->child[i]); } else { return word_tree_insert(str,exp,pt->child[i]); } } } } struct wtree* creatchild() { struct wtree *p = (struct wtree*)malloc(sizeof(struct wtree)); if (p == NULL) { printf("Error,out of memory!\n"); return NULL; } *p = defstr; return p; } int alpcompare(const char a,const char b) { if (toupper(a) == toupper(b)) { if (a == b) { return 0; } else if (a > b) /***** A isLOWER ********/ { return 1; } else if (a < b) { return -1; } else if (a == b) { return 0; } } else if (toupper(a) != toupper(b)) { return (toupper(a) - toupper(b)); } } int exchange(char str[]) { int left = 0; int right = strlen(str) - 1; char temp; while(1) { if ( left <= right) { temp = str[left]; str[left++] = str[right] ; str[right--] = temp; } else{ break; } } }