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++: // clang-format off
#include <bits/stdc++.h>
#define int long long
#define main signed main()
#define loop(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) loop(i, 0, n)
#define forever for (;;)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define prec(n) fixed << setprecision(n)
template<typename A> using V = std::vector<A>;
template<typename A> using F = std::function<A>;
template<typename A, typename B> using P = std::pair<A, B>;
using pii = P<int, int>;
using vi = V<int>;
using vd = V<double>;
using vs = V<std::string>;
using vpii = V<pii>;
using vvi = V<vi>;
using vvpii = V<vpii>;
constexpr int INF = sizeof(int) == sizeof(long long) ? 1000000000000000000LL : 1000000000;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979;
template<typename A, typename B> bool cmin(A &a, const B &b) { return a > b ? (a = b, true) : false; }
template<typename A, typename B> bool cmax(A &a, const B &b) { return a < b ? (a = b, true) : false; }
constexpr bool odd(const int n) { return n & 1; }
constexpr bool even(const int n) { return ~n & 1; }
template<typename T> std::istream &operator>>(std::istream &is, std::vector<T> &v) { for (T &x : v) is >> x; return is; }
template<typename A, typename B> std::istream &operator>>(std::istream &is, std::pair<A, B> &p) { is >> p.first; is >> p.second; return is; }
using namespace std;
// clang-format on

using State = string::const_iterator;

int expr(State &);
int term(State &);
int factor(State &);
int number(State &);

int expr(State &begin) {
  int val = term(begin);
  forever {
    if (*begin == '+') {
      begin++;
      val += term(begin);
    } else if (*begin == '-') {
      begin++;
      val -= term(begin);
    } else {
      break;
    }
  }
  return val;
}

int term(State &begin) {
  int val = factor(begin);
  forever {
    if (*begin == '*') {
      begin++;
      val *= factor(begin);
    } else if (*begin == '/') {
      begin++;
      val /= factor(begin);
    } else {
      break;
    }
  }
  return val;
}

int factor(State &begin) {
  if (*begin == '(') {
    begin++;
    int val = expr(begin);
    begin++;
    return val;
  }
  return number(begin);
}

int number(State &begin) {
  int val = 0;
  while (isdigit(*begin)) {
    val *= 10;
    val += *begin - '0';
    begin++;
  }
  return val;
}

main {
  int n;
  cin >> n;
  cin.ignore();
  while (n--) {
    string s;
    getline(cin, s);
    s.pop_back();
    State begin = s.begin();
    cout << expr(begin) << endl;
  }
}

C++: #include <iostream>
#include <stack>

using namespace std;

int pri(char ch) 
{
    if (ch == '*' || ch == '/')
        return 2;
    if (ch == '+' || ch == '-')
        return 1;
    else
        return 0;
}

int main()
{
    int n;

    cin >> n;

    while (n--) {
        string exp, cha;
        stack<char> pol;
        stack<int> cal;

        cin >> exp;
        for (int i = 0; i < exp.size() - 1; i++) {
            if ('0' <= exp[i] && exp[i] <= '9') {
                while (true) {
                    cha.push_back(exp[i]);
                    if ('0' > exp[i + 1] || exp[i + 1] > '9') {
                        cha.push_back('.');
                        break;
                    }
                    else
                        i++;
                }
            }
            else if (exp[i] == '(')
                pol.push(exp[i]);
            else if (exp[i] == ')') {
                while (true) {
                    if (pol.top() == '(') {
                        pol.pop();
                        break;
                    }
                    cha.push_back(pol.top());
                    pol.pop();

                }
            }
            else {
                while (!pol.empty()) {
                    if (pri(exp[i]) < pri(pol.top())) {
                        cha.push_back(pol.top());
                        pol.pop();
                    }
                    else 
                        break;
                }
                pol.push(exp[i]);
            }
        }

        while (!pol.empty()) {
            cha.push_back(pol.top());
            pol.pop();
        }


        for (int i = 0; i < cha.size(); i++) {
            if ('0' <= cha[i] && cha[i] <= '9') {
                int tmp = cha[i] - '0';

                while (true) {
                    i++;
                    if (cha[i] == '.') 
                        break;
                    tmp *= 10;
                    tmp += cha[i] - '0';
                }
                cal.push(tmp);
            }
            else {
                int a, b;

                b = cal.top();
                cal.pop();
                a = cal.top();
                cal.pop();

                if (cha[i] == '*') 
                    cal.push(a * b);
                else if (cha[i] == '/') 
                    cal.push(a / b);
                else if (cha[i] == '+') 
                    cal.push(a + b);
                else if (cha[i] == '-') 
                    cal.push(a - b);
            }
        }
        cout << cal.top() << endl;
    }

    return 0;
}

C++: #include<vector>
#include<map>
#include<climits>
#include<set>
#include<queue>
#include<algorithm>
#include<functional>
#include<numeric>
#include<utility>
#include<sstream>
#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cctype>
#include<string>
#include<bitset>
#include<cstring>
#include<list>
using namespace std;
typedef vector<int>VI;
typedef vector<VI>VVI;
typedef vector<string>VS;
typedef pair<int,int>PII;
typedef long long LL;
typedef pair<LL,LL>PLL;
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define PB push_back
#define EACH(i,c) for(typeof((c).begin())i=(c).begin();i!=(c).end();i++)
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define F first
#define S second

typedef string::const_iterator State;
int Number(State &Begin){
    int ret=0;
    while(isdigit(*Begin)){
        ret*=10;
        ret+=(*Begin)-'0';
        Begin++;
    }

    return ret;
}
int Expression(State&);
int Factor(State &Begin){
    if(*Begin=='('){
        Begin++;
        int ret=Expression(Begin);
        Begin++;
        return ret;
    }
    else return Number(Begin);
}

int Term(State &Begin){
    int ret=Factor(Begin);
    while(true){
        if(*Begin=='*'){
            Begin++;
            ret*=Factor(Begin);
        }
        else if(*Begin=='/'){
            Begin++;
            ret/=Factor(Begin);
        }
        else break;
    }
    return ret;
}

int Expression(State &Begin){
    int ret=Term(Begin);
    while(true){
        if(*Begin=='+'){
            Begin++;
            ret+=Term(Begin);
        }
        else if(*Begin=='-'){
            Begin++;
            ret-=Term(Begin);
        }
        else break;
    }
    return ret;
}

int main(){
    int N;
    cin>>N;
    cin.ignore();
    while(N--){
        string str;
        getline(cin,str);
        State Begin=str.begin();
        cout<<Expression(Begin)<<endl;
    }
    return 0;
}