Polish calculation

//cww 逆波兰计算器
#include<stack>
#include<cstdio>
#include<iostream>
using namespace std;
stack<double>s;char read(){while (1){printf("Select command and press<Enter>:");char ch; cin>>ch;if (ch=='?'||ch=='='||ch=='+'||ch=='-'||ch=='*'||ch=='/'||ch=='q'||ch=='Q')return ch;puts("Please enter a valid command:");puts("[?]push to stack [=]print top");puts("[+] [-] [*] [/] you know them");puts("[Q]uit =======Bazinga!=======");}
}bool solve(char ch){double x,y;if (ch=='q'||ch=='Q'){puts("Calculation finshed.");return 0;}if (ch=='?'){printf("Enter a real number:");cin>>x; s.push(x);}if (ch=='='){if (s.empty())puts("Stack empty");else printf("%.0lf\n",s.top());}if (ch=='+'||ch=='-'||ch=='*'||ch=='/'){if (s.empty())puts("Stack empty");else{x=s.top(); s.pop();if (s.empty()){puts("Stack has just one entry");s.push(x);}else{y=s.top();s.pop();switch (ch){case'+':s.push(x+y);break;case'-':s.push(x-y);break;case'*':s.push(x*y);break;case'/':s.push(x/y);break;}}}}return 1;
}
//==========cww=2016,2,28=23:27===============
int main(){puts("welcome");while (!s.empty())s.pop();while (solve(read())){}return 0;
}

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