initial commit

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

src/Main.java

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+import java.util.Scanner;
+
+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class Main {
+
+    public static void main(String[] args) {
+
+        Scanner a = new Scanner(System.in);
+        int number1 = a.nextInt();
+       String sing = a.next();
+        int number2 = a.nextInt();
+        System.out.print("Ответ:");
+
+        if (":" .equals(sing) && number2 != 0 ) {
+            float sum = (float) number1 / (float) number2;
+            System.out.println(sum);
+        }
+
+        if (":".equals(sing) && number2 == 0) {
+            System.out.println("на ноль делить нельзя");
+        }
+
+        if ("+" .equals(sing)) {
+            int sum = number1 + number2;
+            System.out.println(sum);
+        }
+
+        if ("-" .equals(sing)) {
+            int sum = number1 - number2;
+            System.out.println(sum);
+        }
+
+        if ("*" .equals(sing))  {
+            int sum = number1 * number2;
+            System.out.println(sum);
+        }
+    }
+}