Feat(calculator.cpp): Implemented a Calculator

exercises/calculator.cpp

@@ -1,12 +1,49 @@
 /*
-  Write a program that given two numbers as input make the main operations.
+    Write a program that given two numbers as input make the main operations.
 
-  Output:
-  Insert first number: 4
-  Insert second number: 2
+    Output:
+    Insert first number: 4
+    Insert second number: 2
 
-  SUM: 6
-  Difference: 2
-  Multiplication: 8
-  Division: 2
+    SUM: 6
+    Difference: 2
+    Multiplication: 8
+    Division: 2
 */
+#include <iostream>
+
+using namespace std;
+
+int main(){
+    int num1;
+    int num2;
+
+    cout<< "Insert first number: ";
+    cin >> num1;
+
+    if(cin.fail()){
+        cerr<<"Error: The given value is not a number"<<endl;
+        exit(1);
+    }
+
+    cout<< "Insert second number: ";
+    cin>> num2;
+
+    if(cin.fail()){
+        cerr<< "Error: The given value is not a number"<<endl;
+        exit(1);
+    }
+
+    cout<<endl<<
+    "SUM: "<< num1 + num2<< endl<<
+    "Difference: " << num1 - num2<< endl<<
+    "Multiplication: "<< num1 * num2 << endl;
+
+    if(num2 == 0){
+        cout<<"Division: Unable to divide by 0"<< endl;
+        return 0;
+    }
+
+    cout<< "Division: "<< num1 / num2 <<endl;
+    return 0;
+}