help me
i want to make infix to prefix program but this code is that two operand is success but more 3 operand fail plz help
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stack.cpp
#include <iostream>
#include "stack.h"
using namespace std;
Stack::Stack(int stackCapcity){
capacity=stackCapcity;
stack=new char[capacity];
top=-1;
}
bool Stack::IsEmpty(){
return top==-1;
}
char Stack::Top(){
if(IsEmpty())throw "Stack is empty";
return stack[top];
}
void Stack::Push(char item){
stack[++top]=item;
}
void Stack::Pop(){
if(IsEmpty())throw "Stack is empty";
top--;
}
main.cpp
#include <iostream>
#include "stack.h"
using namespace std;
int main(void){
string line;
char propmpt;
int length;
int i;
while(getline(cin,line)){
length=line.length();
Stack s(length);
i=0;
if(line.at(0)=='+'){
i++;
}
if(line.at(0)=='-'){
cout<<line.at(0);
i++;
}
for(;i<length;i++){
propmpt=line.at(i);
if(propmpt>47&&propmpt<58){
cout<<propmpt;
}
else{
if(propmpt=='+'||propmpt=='-'){
if(s.IsEmpty()){
s.Push(propmpt);
}
else
{
while(s.IsEmpty()==false||s.Top()!='(')
{
cout<<s.Top();
s.Pop();
}
s.Push(propmpt);
}
}
else if(propmpt=='*'||propmpt=='/'){
if(s.IsEmpty()){
s.Push(propmpt);
}
else
{
while(s.IsEmpty()!=false||s.Top()!='+'||s.Top()!='-'||s.Top()!='('){
cout<<s.Top();
s.Pop();
}
s.Push(propmpt);
}
}
else if(propmpt=='('){
if(s.IsEmpty()){
s.Push(propmpt);
}
else
{
s.Push(propmpt);
}
}
else if(propmpt==')'){
while(s.Top()!='('){
cout<<s.Top();
s.Pop();
}
s.Pop();
}
if(line.at(i+1)=='+'){
i++;
}
if(line.at(i+1)=='-'){
cout<<"-";
i++;
}
}
}
while(s.IsEmpty()==false){
cout<<s.Top();
s.Pop();
}
cout<<endl;
}
}
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What is your Problem?
What does not work?
What do you want to accomplish?
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