Postfix expression using C++ code

Sample Output

// this program code is a postfix expression can be evaluated using a Stack given.
// created by: jieng46
 

#include <iostream> 

#include <iomanip> 

#include <conio.h>  

using namespace std;
struct Node{
    float number;
    Node *next;

};

Node* push(Node *stack, float data){
  Node *utility;
  utility = new Node;
  utility -> number = data;
  utility -> next = stack;
  return utility;
}

Node* pop(Node *stack, float &data){
  Node *temp;
  if (stack != NULL){
    temp = stack;
    data = stack -> number;
    stack = stack -> next;
    delete temp;
  }
  else cout << "\nERROR: Empty stack.\n";
  return stack;
}
int main()
{  
  float jd_answer=0.f, jd_operand1=0.f, jd_operand2=0.f;
  char jd_ch=' ';
  char jd_ans;
  Node *utility, *top;

  utility = new Node;
  utility -> number = 0.f;
  utility -> next = NULL;
  top = new Node;
  top -> number = 0.f;
  top -> next = utility;
 
  
  cout << "\n[press spacebar after you input a number and operation]";
  cout << "\nEnter the postfix expression: ";
  cout << "\nInput: ";
  while(jd_ch != '\n')
     {
        cin >> noskipws >> jd_ch; // "noskipws" do not skip whitespaces
        int jd_operand = 0;
        while(jd_ch == ' '){
            cin >> jd_ch;
        }       
        if((jd_ch >= '0')&&(jd_ch <= '9')){
          while(jd_ch != ' '){
            jd_operand = jd_operand*10 + (jd_ch-48);
            cin >> jd_ch;
          }
          top = push(top, jd_operand);
        }else{
          top=pop(top, jd_operand1);
          top=pop(top, jd_operand2);
          //use of operations
          switch(jd_ch){
            case '+': jd_answer = jd_operand2 + jd_operand1;break;
            case '-': jd_answer = jd_operand2 - jd_operand1;break;
            case '*': jd_answer = jd_operand2 * jd_operand1;break;
            case '/': jd_answer = jd_operand2 / jd_operand1;break;
          }
          top=push(top, jd_answer);
        }
    }
  pop(top, jd_answer);
  cout << "Output: " << jd_answer << endl; //display the result after evaluation
    getche();
  return 0;
}
//end....