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++: #pragma region Macros
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define rep2(i,a,b) for(ll i=a;i<=b;++i)
#define rep(i,n) for(ll i=0;i<n;i++)
#define rep3(i,a,b) for(ll i=a;i>=b;i--)
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define vec vector<int>
#define vecll vector<ll>
#define vecpii vector<pii>
#define vecpll vector<pll>
#define vec2(a,b) vector<vec>(a,vec(b))
#define vec2ll(a,b) vector<vecll>(a,vecll(b))
#define vec3(a,b,c) vector<vector<vec>>(a,vec2(b,c))
#define vec3ll(a,b,c) vector<vector<vecll>>(a,vec2ll(b,c))
#define fi first
#define se second
#define all(c) begin(c),end(c)
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),(x)))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),(x)))
using namespace std;
int in() {int x;cin>>x;return x;}
ll lin() {unsigned long long x;cin>>x;return x;}
string stin() {string s;cin>>s;return s;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
vec iota(int n){vec a(n);iota(all(a),0);return a;}
void print(){putchar(' ');}
void print(bool a){cout<<a;}
void print(int a){cout<<a;}
void print(long long a){cout<<a;}
void print(char a){cout<<a;}
void print(string &a){cout<<a;}
void print(double a){cout<<a;}
template<class T> void print(const vector<T>&);
template<class T, size_t size> void print(const array<T, size>&);
template<class T, class L> void print(const pair<T, L>& p);
template<class T, size_t size> void print(const T (&)[size]);
template<class T> void print(const vector<T>& a){ if(a.empty()) return; print(a[0]); for(auto i = a.begin(); ++i != a.end(); ){ cout<<" "; print(*i); } cout<<endl;}
template<class T> void print(const deque<T>& a){ if(a.empty()) return; print(a[0]); for(auto i = a.begin(); ++i != a.end(); ){ cout<<" "; print(*i); } }
template<class T, size_t size> void print(const array<T, size>& a){ print(a[0]); for(auto i = a.begin(); ++i != a.end(); ){ cout<<" "; print(*i); } }
template<class T, class L> void print(const pair<T, L>& p){ cout<<'(';print(p.first); cout<<","; print(p.second);cout<<')'; }
template<class T, size_t size> void print(const T (&a)[size]){ print(a[0]); for(auto i = a; ++i != end(a); ){ cout<<" "; print(*i); } }
template<class T> void print(const T& a){ cout << a; }
int out(){ putchar('\n'); return 0; }
template<class T> int out(const T& t){ print(t); putchar('\n'); return 0; }
template<class Head, class... Tail> int out(const Head& head, const Tail&... tail){ print(head); putchar(' '); out(tail...); return 0; }
ll gcd(ll a, ll b){ while(b){ ll c = b; b = a % b; a = c; } return a; }
ll lcm(ll a, ll b){ if(!a || !b) return 0; return a * b / gcd(a, b); }
vector<pll> factor(ll x){ vector<pll> ans; for(ll i = 2; i * i <= x; i++) if(x % i == 0){ ans.push_back({i, 1}); while((x /= i) % i == 0) ans.back().second++; } if(x != 1) ans.push_back({x, 1}); return ans; }
vector<int> divisor(int x){ vector<int> ans; for(int i=1;i*i<=x;i++)if(x%i==0){ans.pb(i);if(i*i!=x)ans.pb(x/i);} return ans;}
int popcount(ll x){return __builtin_popcountll(x);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int n){return uniform_int_distribution<int>(0, n)(rng);}
// #define _GLIBCXX_DEBU
#define endl '\n'
#ifdef _MY_DEBUG
    #undef endl
    #define debug(x) cout<<#x<<": "<<x<<endl
    void err(){}
    template<class T> void err(const T& t){ print(t);  cout<<" ";}
    template<class Head, class... Tail> void err(const Head& head, const Tail&... tail){ print(head); putchar(' '); out(tail...); }
#else
    #define debug(x)
    template<class... T> void err(const T&...){}
#endif
#pragma endregion

typedef string::const_iterator State;
class ParseError{};

int number(State &);
int factor(State &);
int expression(State &);
int term(State &);
int number(State &begin){
    int ret = 0;
    while(isdigit(*begin)){
        ret*=10;
        ret+=*begin-'0';
        begin++;
    }
    return ret;
}
int expression(State &begin){
    int ret = term(begin);
    for(;;){
        if(*begin=='+'){
            begin++;
            ret+=term(begin);
        }
        else if(*begin=='-'){
            begin++;
            ret-=term(begin);
        }
        else break;
    }
    return ret;
}
int term(State &begin){
    int ret = factor(begin);
    for(;;){
        if(*begin=='*'){
            begin++;
            ret*=factor(begin);
        }
        else if(*begin=='/'){
            begin++;
            ret/=factor(begin);
        }
        else{
            break;
        }
    }
    return ret;
}
int factor(State &begin){
    if(*begin=='('){
        begin++;
        int ret = expression(begin);
        begin++;
        return ret;
    }
    else{
        return number(begin);
    }
}


signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);cout<<fixed<<setprecision(15);
    string s;
    int n=in();
    cin.ignore();
    rep(i,n){
        getline(cin,s);
        State begin = s.begin();
        cout << expression(begin) << endl;
    }
}

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

string S;
size_t cur = 0;
char readchar();
char peek();
int digit();
int number();
int term();
int expression();
int factor();

int main() {
    int N;
    cin >> N;
    for(int i = 0; i < N; ++i){
        cur = 0;
        cin >> S;
        S.resize(S.size()-1);
        cout << expression() << endl;
    }
    return 0;
}

char readchar(){
    assert(cur < S.size());
    char ret = S[cur];
    cur += 1;
    return ret;
}

char peek(){
    assert(cur < S.size());
    return S[cur];
}

int digit(){
    assert(isdigit(peek()));
    int n = readchar() - '0';
    return n;
}

int number(){
    int n = digit();
    while(cur < S.size() && isdigit(peek()))
        n = n*10 +digit();
    return n;
}

int term()
{
    int a = factor();
    while(cur < S.size() && (peek() == '*' || peek() == '/')){
        char op = readchar();
        int b = factor();
        if (op == '*') a *= b; else a /= b;
    }
    return a;
}

int expression(){
    int a = term();
    while(cur < S.size() && (peek() == '+' || peek() =='-'))
    {
        char op =readchar();
        int b = term();
        if(op == '+')
        {
            a += b;
        }
        else a -= b;
    }
    return a;
}
int factor() {
    if (peek() != '(') return number();
    cur += 1;
    int n = expression();
    assert(peek() == ')');
    cur += 1;
    return n;
}
int parse() {return expression();}