7-85 1024 四则运算

#include <algorithm>
#include <cmath>
#include <cstdint>
#include <iomanip>
#include <iostream>
#include <limits>
#include <numeric>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

using i32 = std::int32_t;
using i64 = std::int64_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;
using pii = std::pair<i32, i32>;
using pll = std::pair<i64, i64>;
using vi = std::vector<i32>;
using vll = std::vector<i64>;
using vpii = std::vector<pii>;
using vpll = std::vector<pll>;

void solve();

int main()
{
    std::cin.tie(nullptr)->sync_with_stdio(false);
    solve();
}

std::string get_number_output(i32 n)
{
    if (n < 0)
    {
        return "(" + std::to_string(n) + ")";
    }
    return std::to_string(n);
}

void solve()
{
    i32 a, b;
    char opt;
    while (std::cin >> a >> b >> opt)
    {
        i32 result;
        if (opt == '+')
        {
            result = a + b;
        }
        else if (opt == '-')
        {
            result = a - b;
        }
        else if (opt == '*')
        {
            result = a * b;
        }
        else if (opt == '/')
        {
            result = a / b;
        }
        else
        {
            result = a % b;
        }
        std::cout << a << ' ' << opt << ' ' << get_number_output(b) << " = " << result << std::endl;
    }
}