• 二叉树运用


    #include<stdlib.h>
    #include<stdio.h>
    #include<string.h>
    #include<ctype.h>
    #define MAX_LEN 5
    typedef struct node{
      char optr;
      int data;
      struct node* lchild;
      struct node* rchild;
    }BTNode;
    BTNode * getNode(char *str,int &pos){
     BTNode *createTree(char *str,int &pos);
     BTNode *p=new BTNode;
     char ch=str[0];
     if(isdigit(ch)){
      int i=0;
      char data[MAX_LEN];
      while(isdigit(ch=str[i]))
       data[i++]=ch;
      p->data=atoi(data);
      pos+=i;
     }
     else if(ch=='+'||ch=='-'||ch=='*'||ch=='/'){
      p->optr=ch;
      pos+=1;
     }
     else if(ch=')'){
      pos+=1;
      return NULL;
     }
     else if(ch=='')
      return NULL;
     return p;
    }
     int getPriority(char optr){
      switch(optr){
       case'+':
       case'/':
        return 1;
       case'*':
       case'/':
        return 2;
      }
      return 0;
     }
     BTNode *createTree(char *str,int &pos){
      int pos1=0;
      BTNode *lchild=getNode(str+pos1,pos1);
      BTNode *root=getNode(str+pos1,pos1);
      BTNode *rchild=getNode(str+pos1,pos1);
      root->lchild=lchild;
      root->rchild=rchild;
      BTNode *node;
      while((node=getNode(str+pos1,pos1))){
       if(getPriority(root->optr)>getPriority(node->optr)){
        node->lchild=root;
        node->rchild=getNode(str+pos1,pos1);
        root=node;
       }
       else{
        node->lchild=root->rchild;
        root->rchild=node;
        node->rchild=getNode(str+pos1,pos1);
       }
      }
      pos+=pos1;
      return root;
     }
    int result(BTNode *b){
     int n1,n2;
     switch(b->optr){
      case'+':
       n1=result(b->lchild);
       n2=result(b->rchild);
       b->data=n1+n2;
       break;
      case'-':
       n1=result(b->lchild);
       n2=result(b->rchild);
       b->data=n1-n2;
       break;
      case'*':
       n1=result(b->lchild);
       n2=result(b->rchild);
       b->data=n1*n2;
       break;
      case'/':
       n1=result(b->lchild);
       n2=result(b->rchild);
       b->data=n1/n2;
       break;
      default:
       return b->data;
     }
     return b->data;
    }
    int main(){
     BTNode*b=NULL,*q=NULL;
     char str[100];
     printf("Please enter SQC£º");
     scanf("%s",str);
     int n=0,i=0;
     while(str[i++]!='')
      n++;
     int pos=0;
     b=createTree(str,pos);
     printf("ASM:%d
    ",result(b));
    }
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  • 原文地址:https://www.cnblogs.com/pengjunwei/p/3677681.html
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