One line gives "a op b" separated by single spaces, where op is one of +, -, *, /.
Print the result as an integer.
/ is integer division and the fractional part of the quotient is dropped toward zero (7 / 2 = 3, -7 / 2 = -3, 7 / -2 = -3).
For / with b equal to 0, print "error".
-7 / 2
-3
1000000 * 1000000
1000000000000
When you run, these lines are fed to input()/stdin in order (the program doesn't stop to ask).
$ Ready
Open this on a computer to write and run code. On mobile you can read the problem and the solutions.
The direction of negative division differs.
In C, C++, Java and C#, integer / truncates toward zero, so -7 / 2 == -3, but Python's // floors, giving -4.
In Python use abs(a) // abs(b) with the sign put back, or int(a / b) (exact within this problem's range).
JS/TS / is always floating-point, so Math.trunc(a / b) is right and Math.floor falls into the same trap as Python.
Craykon's / also gives 3.5, so use Mathf.Quot(a, b) (truncates toward zero).
Products reach one trillion, so int in C, Java and C# (about 2.1 billion max) overflows — use long long/long.
Guard division by zero first: Java throws ArithmeticException, C# throws DivideByZeroException, C and C++ have undefined behavior (usually a crash), JS gives Infinity/NaN.
Branching: switch in C, C++, Java, C#, JS; match in Python 3.10+.
Craykon writes switch (op) { case "+": … default: … } and, like C#, never falls through to the next case (the final break; is optional).
In C, C++, Java and JS a missing break runs into the next case.
In JS 0 * -5 is -0 and console.log(-0) prints -0, so print String(…).
a, op, b = input().split()a, b = int(a), int(b)match op: case "+": print(a + b) case "-": print(a - b) case "*": print(a * b) case "/": if b == 0: print("error") else: # Python의 // 는 내림(-7 // 2 == -4)이라 크기로 나눈 뒤 부호를 붙인다 q = abs(a) // abs(b) print(q if (a < 0) == (b < 0) else -q)const [x, op, y] = require("fs").readFileSync(0, "utf8").trim().split(/\s+/);const a = Number(x);const b = Number(y);let result;switch (op) { case "+": result = a + b; break; case "-": result = a - b; break; case "*": result = a * b; break; case "/": result = b === 0 ? "error" : Math.trunc(a / b); break;}// String(-0) 은 "0" (console.log(-0) 은 "-0"을 찍는다)console.log(String(result));import { readFileSync } from "node:fs";const [x, op, y]: string[] = readFileSync(0, "utf8").trim().split(/\s+/);const a: number = Number(x);const b: number = Number(y);let result: number | string = "";switch (op) { case "+": result = a + b; break; case "-": result = a - b; break; case "*": result = a * b; break; case "/": result = b === 0 ? "error" : Math.trunc(a / b); break;}// String(-0) 은 "0" (console.log(-0) 은 "-0"을 찍는다)console.log(String(result));import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); long a = sc.nextLong(); String op = sc.next(); long b = sc.nextLong(); String result = switch (op) { case "+" -> String.valueOf(a + b); case "-" -> String.valueOf(a - b); case "*" -> String.valueOf(a * b); case "/" -> b == 0 ? "error" : String.valueOf(a / b); default -> ""; }; System.out.println(result); }}using System; class Program{ static void Main() { string[] t = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries); long a = long.Parse(t[0]); long b = long.Parse(t[2]); string result = t[1] switch { "+" => (a + b).ToString(), "-" => (a - b).ToString(), "*" => (a * b).ToString(), "/" => b == 0 ? "error" : (a / b).ToString(), _ => "", }; Console.WriteLine(result); }}#include <iostream> int main() { long long a, b; char op; std::cin >> a >> op >> b; switch (op) { case '+': std::cout << a + b << "\n"; break; case '-': std::cout << a - b << "\n"; break; case '*': std::cout << a * b << "\n"; break; case '/': if (b == 0) std::cout << "error\n"; else std::cout << a / b << "\n"; break; }}#include <stdio.h> int main(void) { long long a, b; char op; scanf("%lld %c %lld", &a, &op, &b); switch (op) { case '+': printf("%lld\n", a + b); break; case '-': printf("%lld\n", a - b); break; case '*': printf("%lld\n", a * b); break; case '/': if (b == 0) puts("error"); else printf("%lld\n", a / b); break; } return 0;}t = Console.ReadLine().Split();a = t[0].ToNumber();op = t[1];b = t[2].ToNumber();switch (op){ case "+": Console.WriteLine(a + b); break; case "-": Console.WriteLine(a - b); break; case "*": Console.WriteLine(a * b); break; default: if (b == 0) { Console.WriteLine("error"); } else { Console.WriteLine(Mathf.Quot(a, b)); } break;}