美好的一天,每个人!我是C++新手(在这里也是在stackoverflow),我需要你的专家帮助。即使没有错误或警告,此代码也有问题。它只是在程序执行时挂起。
该程序使用链接列表(堆栈)将中缀转换为后缀。在C++中使用堆栈(链表)插入后缀转换
# include <iostream>
# include <cstring>
using namespace std;
struct node {
char data;
node *next;
};
node *top=NULL;
node *bottom=NULL;
node *entry;
node *last_entry;
node *second_last_entry;
void push(const char Symbol) {
entry=new node;
if(bottom==NULL) {
entry->data=Symbol;
entry->next=NULL;
bottom=entry;
top=entry;
}
else {
entry->data=Symbol;
entry->next=NULL;
top->next=entry;
top=entry;
}
}
const char pop() {
char Symbol=NULL;
if(bottom==NULL)
cout<<"\n\n\n\t *** Error : Stack is empty. \n"<<endl;
else {
for (last_entry=bottom; last_entry->next!=NULL; last_entry=last_entry->next)
second_last_entry=last_entry;
if(top==bottom)
bottom=NULL;
Symbol=top->data;
delete top;
top=second_last_entry;
top->next=NULL;
}
return Symbol;
}
void infix_to_postfix(const char *Infix) {
char Infix_expression[100]={NULL};
char Postfix_expression[100]={NULL};
strcpy(Infix_expression,"(");
strcat(Infix_expression,Infix);
strcat(Infix_expression,")");
char Symbol[5]={NULL};
char Temp[5]={NULL};
for(int count=0;count<strlen(Infix_expression);count++) {
Symbol[0]=Infix_expression[count];
if(Symbol[0]=='(')
push(Symbol[0]);
else if(Symbol[0]==')') {
Symbol[0]=pop();
while(Symbol[0]!='(')
{
strcat(Postfix_expression,Symbol);
Symbol[0]=pop();
}
}
else if(Symbol[0]=='^' || Symbol[0]=='*' || Symbol[0]=='/'
|| Symbol[0]=='+' || Symbol[0]=='-')
{
if(Symbol[0]=='*' || Symbol[0]=='/')
{
Temp[0]=pop();
while(Temp[0]=='^' || Temp[0]=='*' || Temp[0]=='/')
{
strcat(Postfix_expression,Temp);
Temp[0]=pop();
}
push(Temp[0]);
}
else if(Symbol[0]=='+' || Symbol[0]=='-')
{
Temp[0]=pop();
while(Temp[0]!='(')
{
strcat(Postfix_expression,Temp);
Temp[0]=pop();
}
push(Temp[0]);
}
push(Symbol[0]);
}
else
strcat(Postfix_expression,Symbol);
}
cout<<"\n\n Postfix Expression : "<<Postfix_expression;
}
int main() {
char Infix_expression[100]={NULL};
cout<<"\n\n Enter the Infix Expression : ";
cin>>Infix_expression;
infix_to_postfix(Infix_expression);
return 0;
}
请帮帮我!我是一个新手,如果没有你们,我不会走得太远。非常感谢你!
你知道如何在调试器中运行你的代码吗? – 2012-03-18 13:30:09
恐怕不是。顺便说一句,我正在使用代码块。 – 2012-03-18 13:31:47
我想你需要在实际解决这个问题之前学习如何调试。 – 2012-03-18 13:42:55