fork download
copy 
  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. queue<double> Num;
  5. queue<char> Sig;
  6. #define MAX -2000000000
  7. double Evit(){
  8.     double a=Num.front();
  9.     Num.pop();
  10.     if(Sig.empty()) return a;
  11.     while(Sig.front()=='*' || Sig.front()=='/'){
  12.         if(Sig.front()=='*'){
  13.             a=a*Num.front();
  14.         }else{
  15.             if(Num.front()==0) return MAX;
  16.             a=a/Num.front();
  17.         }
  18.         Num.pop();
  19.         Sig.pop();
  20.         if(Sig.empty()) return a;
  21.     }
  22.     return a;
  23. }
  24.  
  25. int main()
  26. {
  27.     string s;
  28.     while(cin>>s){
  29.         double ans=0;
  30.         stringstream S(s);
  31.         double num;
  32.         char sig;
  33.         while(S>>num){
  34.             Num.push(num);
  35.             //cout<<"num:"<<num<<endl;
  36.             if(S>>sig){
  37.                 Sig.push(sig);
  38.                 //cout<<"sig:"<<sig<<endl;
  39.             }
  40.         }
  41.         double a=Num.front();
  42.         Num.pop();
  43.         bool com=true;
  44.         while(!Sig.empty()){
  45.             char si=Sig.front();
  46.             Sig.pop();
  47.             if(si=='+'){
  48.                 double b=Evit();
  49.                 //cout<<"hi"<<endl;
  50.                 if(b==MAX){
  51.                     com=false;
  52.                     break;
  53.                 }
  54.                 a=a+b;
  55.                 //cout<<"a:"<<a<<endl;
  56.             }else if(si=='-'){
  57.                 double b=Evit();
  58.                 if(b==MAX){
  59.                     com=false;
  60.                     break;
  61.                 }
  62.                 a=a-b;
  63.             }else if(si=='*'){
  64.                 double b=Evit();
  65.                 if(b==MAX){
  66.                     com=false;
  67.                     break;
  68.                 }
  69.                 a=a*b;
  70.                 //cout<<"b:"<<b<<endl;
  71.             }else if(si=='/'){
  72.                 double b=Evit();
  73.                 if(b==MAX || b==0){
  74.                     com=false;
  75.                     break;
  76.                 }
  77.                 a=a/b;
  78.             }
  79.             //cout<<"que"<<endl;
  80.             //cout<<"so:"<<Sig.empty()<<endl;
  81.             //system("pause");
  82.         }
  83.         if(com){
  84.             cout<<fixed<<setprecision(2)<<a<<endl;
  85.         }else{
  86.             cout<<"division entre cero"<<endl;
  87.         }
  88.     }
  89.     return 0;
  90. }
Success #stdin #stdout 0s 4404KB
comments (?)
stdin
copy 
1+2*3
stdout
copy 
7.00
https://ideone.com/AknWo6
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!