fixed

file.js

@@ -74,27 +74,67 @@ if (age === '' || age === null){
 
         // default: if 
 
-let defName1 = 'Marko';
- let defSurname1 = 'Volchenko';
-  let defMiddleName1 = 'Alexandrovich';
-   let name2 = prompt("Enter your name")
-    if (name2 === null || " ") {
-     name2 =  defName1}
-      let surname2 = prompt("Enter your surname")
-    if (surname2 === null || " ") {
-     surname2 =  defSurname1}
-       let middleName2 = prompt("Enter your middlename")
-    if (middleName2 === null || " ") {
-     middleName2 =  defMiddleName1}
+        let defName1 = 'Marko'
+        let defSurname1 = 'Volchenko'
+        let defMiddleName1 = 'Alexandrovich';
+        let name2 = prompt("Enter your name")
+        if (name2 === null || name2 === "") {
+        name2 =  defName1} else {name2};
+        let surname2 = prompt("Enter your surname")
+        if (surname2 === null || surname2 === "") {
+        surname2 =  defSurname1} else {surname2};
+        let middleName2 = prompt("Enter your middlename")
+        if (middleName2 === null || middleName2 === "") {
+        middleName2 =  defMiddleName1} else {middleName2};
         alert( name2 + ' ' + surname2 + ' ' + middleName2);
         
         // login and password
 
-
-//         let log =  prompt('Enter login');
-// if (log == 'admin'){let passw = prompt('Enter your password')}
-
-// if (passw == 'qwerty'){alert('Great!')};
-  
-
-// нужно доделать
+        let login = prompt('Enter your login');
+if (login === 'admin'){alert('Great!')}
+else {alert('Error')}
+let pass = prompt('Enter your password');
+
+if (pass === 'qwerty'){alert("Great!")}
+                       else{alert('Error')};
+
+
+                //        currency calc
+                let currency = prompt("usd or eur?");
+                let course;
+                switch(currency){
+                        case 'usd':course = 36.65;
+                            break
+                        case 'eur':course = 37.95;
+                            break
+                }
+                        let uah = prompt('How much hrivna?');
+                        let result = Math.floor(uah/course);
+                        alert(`You have ${result} currency`);
+
+
+
+                        // currency calc: two rates
+
+                        let currency1 = prompt("usd or eur?");
+                        let currency2 = prompt('buy or sell?')
+                        let course1;
+                        let course2;
+                        switch(currency1 && currency2 )  {
+                        case 'usd' && 'sell':course1 = 37.03;
+                            break
+                        case 'eur' && 'sell':course1 = 37.87;
+                            break
+                        case 'usd' && 'buy':course2 = 36.65;
+                        break
+                        case 'eur' && 'buy':course2 = 37.47;
+                        break
+                
+                        }
+                        let uah1 = prompt('How much hrivna?');
+                        let result1 = Math.floor(uah1/course1 || uah1/course2);
+                        alert(`You have ${result1} currency`);
+
+                        // currency calc: if
+                         
+