Go: package main

import (
	"bufio"
	"fmt"
	"go/token"
	"go/types"
	"os"
	"strconv"
	"strings"
)

func main() {
	stdin := bufio.NewScanner(os.Stdin)
	stdin.Scan()
	n, _ := strconv.Atoi(stdin.Text())
	for i := 0; i < n; i++ {
		stdin.Scan()
		exp := strings.TrimRight(stdin.Text(), "=")
		res, _ := types.Eval(token.NewFileSet(), nil, token.NoPos, exp)
		fmt.Println(res.Value)
	}
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#include <stack>
#include <vector>

using namespace std;

int getPriority(char ch){
  switch(ch){
  case '+':
    return 0;
  case '-':
    return 1;
  case '*':
    return 2;
  case '/':
    return 3;
  default:
    return -1;
  }
}

vector<string> toReversePorland(string str){

  vector<string> hand;
  vector<string> side;
  
  for(int i = 0; i < str.size(); i++){
    if(str[i] == ' ')
      continue;
    else if(str[i] == '=')
      break;
    if(str[i] >= '0' && str[i] <= '9'){
      string num;
      while(i < str.size()){
	if(str[i] < '0' || str[i] > '9'){
	  break;
	}
	num += str[i];
	i++;
      }
      hand.push_back(num);
      i--;
    }
    else if(str[i] == '('){
      string tmp;
      tmp += str[i];
      side.push_back(tmp);
    }
    else if(str[i] == ')'){
      // ツ右ツ環古環づ慊づ可可算ツ子ツづーツ暗ェツづつつクツづつ偲ィツ個ウツづ可姪淞つキ
      for(int j = side.size()-1 ; ;j--){
	if(side[j] == "("){
	  if(j != 0){
	    vector<string> tmp;
	    for(int k = 0; k < j; k++){
	      tmp.push_back(side[k]);
	    }
	    side = tmp;
	  }
	  else
	    side.clear();
	  break;
	}
	else{
	  string tmp = side[j];
	  hand.push_back(tmp);
	}
      }
    }
    else{
      if(side.size() == 0){
	string tmp;
	tmp += str[i];
	side.push_back(tmp);
      }
      else{
	char cs = side[side.size()-1][0];
	if(cs != '+' && cs != '-' && cs != '*' && cs != '/'){
	  string tmp;
	  tmp += str[i];
	  side.push_back(tmp);
	}
	else{
	  if(getPriority(str[i]) < getPriority(cs)){
	    hand.push_back(side[side.size()-1]);
	    string tmp;
	    tmp += str[i];
	    side[side.size()-1] = tmp;
	  }
	  else{
	    string tmp;
	    tmp += str[i];
	    side.push_back(tmp);
	  }
	}
      }
      
      // else if(str[i] == '+' || str[i] == '-'){
      // 	if(side[side.size()-1] == "*" || side[side.size()-1] == "/"){
      // 	  hand.push_back(side[side.size()-1]);
      // 	  string tmp;
      // 	  tmp += str[i];
      // 	  side[side.size()-1] = tmp;
      // 	}
      // 	else{
      // 	  string tmp;
      // 	  tmp += str[i];
      // 	  side.push_back(tmp);
      // 	}
      // }
      // else{
      // 	if(side[side.size()-1] == "*" || side[side.size()-1] == "/"){
      // 	  hand.push_back(side[side.size()-1]);
      // 	  string tmp;
      // 	  tmp += str[i];
      // 	  side[side.size()-1] = string(tmp);
      // 	}
      // 	else{
      // 	  string tmp;
      // 	  tmp += str[i];
      // 	  side.push_back(tmp);
      // 	}
      // }
    }
  }

  for(int i = side.size()-1; i >= 0; i--){
    hand.push_back(string(side[i]));
  }
  
  return hand;
}


int calc(vector<string> str){
  stack<int> st;
  for(int i = 0; i < str.size(); i++){
    if(str[i] == "+" || str[i] == "-" || str[i] == "*" || str[i] == "/"){
      int val[2];
      val[0] = st.top();
      st.pop();
      val[1] = st.top();
      st.pop();
      if(str[i] == "+"){
	st.push(val[0] + val[1]);
      }
      if(str[i] == "-"){
	st.push(val[1] - val[0]);
      }
      if(str[i] == "*"){
	st.push(val[0] * val[1]);
      }
      if(str[i] == "/"){
	st.push(val[1] / val[0]);
      }
    }
    else{
      st.push(atoi(str[i].c_str()));
    }
  }
  return st.top();
}

int main(){

  int n;
  string s;
  getline(cin,s);
  n = atoi(s.c_str());

  vector<string> input;
  string str;
  for(int i = 0; i < n; i++){
    getline(cin,str);
    input.push_back(str);
  }

  for(int i = 0; i < n; i++){
    str = input[i];
    // vector<string> vec = toReversePorland(str);
    // for(int i = 0; i < vec.size(); i++)
    //   cout << vec[i] << endl;
    cout << calc(toReversePorland(str)) << endl;
  }
  
  return 0;
}

C++: #include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <deque>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <bitset>
#include <functional>
#include <utility>
#include <algorithm>
#include <numeric>
#include <typeinfo>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <ctime>

using namespace std;

#define dump(n) cout<<"# "<<#n<<"="<<(n)<<endl
#define debug(n) cout<<__FILE__<<","<<__LINE__<<": #"<<#n<<"="<<(n)<<endl
#define repi(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,n) repi(i,0,n)
#define iter(c) __typeof((c).begin())
#define foreach(i,c) for(iter(c) i=(c).begin();i!=(c).end();i++)
#define allof(c) (c).begin(),(c).end()
#define mp make_pair

typedef unsigned int uint;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;
typedef pair<int,int> pii;

typedef pair<ll,const char*> parsed;

parsed expr(const char*);
parsed term(const char*);
parsed fact(const char*);

parsed expr(const char* s)
{
	//cout<<"expr(\""<<s<<"\")"<<endl;
	parsed now=term(s);
	while(*now.second=='+' || *now.second=='-'){
		char op=*now.second;
		parsed next=term(now.second+1);
		if(op=='+')
			now=parsed(now.first+next.first,next.second);
		else
			now=parsed(now.first-next.first,next.second);
	}
	//cout<<"expr(\""<<s<<"\")="<<now.first<<endl;
	return now;
}

parsed term(const char* s)
{
	//cout<<"term(\""<<s<<"\")"<<endl;
	parsed now=fact(s);
	while(*now.second=='*' || *now.second=='/'){
		char op=*now.second;
		parsed next=fact(now.second+1);
		if(op=='*')
			now=parsed(now.first*next.first,next.second);
		else
			now=parsed(now.first/next.first,next.second);
	}
	//cout<<"term(\""<<s<<"\")="<<now.first<<endl;
	return now;
}

//parsed fact(const char* s)
//{
//	//cout<<"fact(\""<<s<<"\")"<<endl;
//	if(s[0]=='('){
//		parsed res=expr(s+1);
//		res.second++;
//		return res;
//	}
//	else{
//		const char* p=s;
//		if(*p=='-')
//			p++;
//		ll n=0;
//		while(isdigit(*p)){
//			n=n*10+*p-'0';
//			p++;
//		}
//		return parsed(n,p);
//	}
//}

parsed fact(const char *p)
{
  if (isdigit(*p)){
    //int t=*(p++)-'0';
    int t=0;
    while(isdigit(*p)) t=t*10+*(p++)-'0';
    return parsed(t,p);
  }
  else if (*p=='('){
    parsed r=expr(p+1);
    if (*r.second!=')') exit(0); // invalid input
    return parsed(r.first,r.second+1);
  }
  else
    exit(0); // invalid input
}

int main()
{
	string s;
	getline(cin,s);
	while(getline(cin,s))
		cout<<expr(s.c_str()).first<<endl;
	
	return 0;
}