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<vector>
#include<string>
#include<sstream>
#include<algorithm>

std::string find(std::vector<std::string>&v, int a, bool b){

	std::string res;

	if (b){
		for (int i = a - 1; i >= 0; i--){
			if (v[i] != "T"){
				res = v[i];
				v[i] = "T";
				break;
			}
		}
	}

	if (!b){
		for (int i = a + 1; i < v.size(); i++){
			if (v[i] != "T"){
				res = v[i];
				v[i] = "T";
				break;
			}
		}
	}

	return res;
}

int toint(std::string str){

	int res;
	std::stringstream z;

	z << str;
	z >> res;

	return res;

}

std::string tostring(int a){

	std::string str;
	std::stringstream z;

	z << a;
	z >> str;

	return str;

}

std::string keisan(std::string lhs, std::string rhs, int t){

	int a, b, c;

	a = toint(lhs);
	b = toint(rhs);

	if (t == 1)c = a + b;
	if (t == 2)c = a - b;
	if (t == 3)c = a * b;
	if (t == 4)c = a / b;

	return tostring(c);

}

std::string keisan2(std::vector<std::string> &v){

	int res = 0;

	for (int i = 0, j = 0, k = 0; i < v.size(); i++){
		if (v[i] == "(")j = i, k++;
		if (v[i] == ")"){
			k--;
			if (k == 0){
				std::vector<std::string>w;
				for (int p = j + 1; p < i; p++)w.push_back(v[p]);
				v[j] = keisan2(w);
				for (int p = j + 1; p <= i; p++)v[p] = "T";
			}
		}
	}


	for (int i = 0; i < v.size(); i++){
		if (v[i] == "*"){
			v[i - 1] = keisan(find(v, i, 1), find(v, i, 0), 3);
			v[i] = v[i + 1] = "T";
		}
		if (v[i] == "/"){
			v[i - 1] = keisan(find(v, i, 1), find(v, i, 0), 4);
			v[i] = v[i + 1] = "T";
		}
	}

	for (int i = 0; i < v.size(); i++){
		if (v[i] == "+"){
			v[i - 1] = keisan(find(v, i, 1), find(v, i, 0), 1);
			v[i] = v[i + 1] = "T";
		}
		if (v[i] == "-"){
			v[i - 1] = keisan(find(v, i, 1), find(v, i, 0), 2);
			v[i] = v[i + 1] = "T";
		}
	}

	v[v.size() - 1] = "T";
	for (int i = 0; i < v.size(); i++)if (v[i] != "T")res = toint(v[i]);

	return tostring(res);

}


int main(){

	int n;
	std::cin >> n;

	for (int i = 0; i < n; i++){

		std::string str;

		std::cin >> str;

		std::vector<std::string> v;

		for (int i = 0, j = 0; i < str.size(); i++){

			if (!(str[i] >= '0'&&str[i] <= '9')){
				if (i - j > 0)v.push_back(str.substr(j, i - j));
				v.push_back(str.substr(i, 1));
				j = i + 1;
			}
		}

		std::cout << keisan2(v) << std::endl;
	}

	return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;

int p;
string str;

int Term();
int Factor();
int Elem();
int Digit();

int Term() {
  int a = Factor();
  while (str[p] == '+' || str[p] == '-') {
    char c = str[p];
    p++; // read [+-]
    int b = Factor();
    if (c == '+') {
      a = a + b;
    } else {
      a = a - b;
    }
  }
  return a;
}

int Factor() {
  int a = Elem();
  while (str[p] == '*' || str[p] == '/') {
    char c = str[p];
    p++; // read [*/]
    int b = Elem();
    if (c == '*') {
      a = a * b;
    } else {
      a = a / b;
    }
  }
  return a;
}

int Elem() {
  if (str[p] == '(') {
    p++; // read (
    int a = Term();
    p++; // read )
    return a;
  } else {
    int a = 0;
    while (isdigit(str[p])) {
      int b = Digit();
      a = 10 * a + b;
    }
    return a;
  }
}

int Digit() {
  int a = str[p] - '0';
  p++; // read [0-9]
  return a;
};

int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> str;
    p = 0;
    cout << Term() << endl;
  }
}

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

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 == '/') && (str[i] == '*' || str[i] == '/')){
	  hand.push_back(side[side.size()-1]);
	  string tmp;
	  tmp += str[i];
	  side[side.size()-1] = tmp;
	}
	if((cs == '+' || cs == '-') && (str[i] == '+' || str[i] == '-')){
	  hand.push_back(side[side.size()-1]);
	  string tmp;
	  tmp += str[i];
	  side[side.size()-1] = tmp;
	}
	else 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);
	  }
	}
      }
    }
  }

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


long long calc(vector<string> str){
  stack<long long> st;
  for(int i = 0; i < str.size(); i++){
    if(str[i] == "+" || str[i] == "-" || str[i] == "*" || str[i] == "/"){
      long long 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;
  cin >> n;
  
  vector<string> input;
  string str;
  for(int i = 0; i < n; i++){
    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;
}