diff --git a/04_Day_Conditionals/04_day_conditionals.md b/04_Day_Conditionals/04_day_conditionals.md
index 0100844..fe71f61 100644
--- a/04_Day_Conditionals/04_day_conditionals.md
+++ b/04_Day_Conditionals/04_day_conditionals.md
@@ -325,7 +325,7 @@ isRaining
 
 1. Write a code which  can give grades to students according to theirs scores:
    - 80-100, A
-   - 70-89, B
+   - 70-79, B
    - 60-69, C
    - 50-59, D
    - 0-49, F
diff --git a/04_Day_Conditionals/04_day_starter/index.html b/04_Day_Conditionals/04_day_starter/index.html
index 093c6e6..260829a 100644
--- a/04_Day_Conditionals/04_day_starter/index.html
+++ b/04_Day_Conditionals/04_day_starter/index.html
@@ -9,6 +9,8 @@
 
 	<!-- import your scripts here -->
 	<script src="./scripts/main.js"></script>
+	<script src="./scripts/day4.js"></script>
+
 
 </body>
 
diff --git a/04_Day_Conditionals/04_day_starter/scripts/day4.js b/04_Day_Conditionals/04_day_starter/scripts/day4.js
new file mode 100644
index 0000000..cd536e9
--- /dev/null
+++ b/04_Day_Conditionals/04_day_starter/scripts/day4.js
@@ -0,0 +1,103 @@
+// let age = prompt('age?')
+// if(age > 18){
+//     console.log('you are old enough to drive')
+// }else{
+//     console.log(`you are left with ${18-age} years to drive`)
+// }
+// let myAge = prompt('my age?')
+// let yourAge = prompt('your age?')
+// if(myAge< yourAge){
+//     console.log(`you are ${yourAge-myAge} years older than me`)
+// }
+// let a = 4
+// let b = 3
+// a>b
+//     ?console.log(`${a} is greater than ${b}`)
+//     :console.log(`${b} is greater than ${a}`)
+// let num = prompt('number')
+// if(num%2 == 0){
+//     console.log(`${num} is an even number`)
+// }else{
+//     console.log(`${num} is an odd number`)
+// }
+
+// //exercise 2
+// let grade = prompt('grade?')
+// switch(grade){
+//     case (grade >=80) &&(grade <= 100):
+//         console.log('A')
+//     case (grade >=70) &&(grade <= 79):
+//         console.log('B')
+//     case (grade >=60) &&(grade <= 69):
+//         console.log('C')
+//     case (grade >=50) &&(grade <= 59):
+//         console.log('D')
+//     case (grade >=0) &&(grade <= 49):
+//         console.log('F')
+// }
+// let season = prompt('season')
+// switch(season){
+//     case ((season == 'September')||(season == 'October')||(season =='November')):
+//         console.log('the season is Autumn')
+//     case ((season == 'December')||(season == 'January')||(season =='February')):
+//         console.log('the season is Winter')
+//     case ((season == 'March')||(season == 'April')||(season =='May')):
+//         console.log('the season is Spring')
+//     case ((season == 'June')||(season == 'July')||(season =='August')):
+//         console.log('the season is Summer')
+// }
+// let week = prompt('what day of the week')
+// if((week =="Saturday") || (week == "Sunday")){
+//         console.log(`${week} is a weekend`)
+// }else{
+//     console.log(`${week} is a working day`)
+// }
+//exercise 3
+let year = prompt('enter year')
+let month = prompt('enter month')
+switch(month){
+    case 'January':
+        console.log(`${month} has 31 days`)
+        break
+    case 'February':
+        if((year % 4 ==0 ) && (year % 100 != 0)){
+            console.log(`${month} has 29 days`)
+            break
+        }else{
+            console.log(`${month} has 28 days`)
+            break
+        }
+    case "March":
+        console.log(`${month} has 31 days`)
+        break
+    case "April":
+        console.log(`${month} has 30 days`)
+        break
+    case "May":
+        console.log(`${month} has 31 days`)
+        break
+    case "June":
+        console.log(`${month} has 30 days`)
+        break
+    case "July":
+        console.log(`${month} has 31 days`)
+        break
+    case "August":
+        console.log(`${month} has 31 days`)
+        break
+    case "September":
+        console.log(`${month} has 30 days`)
+        break
+    case "October":
+        console.log(`${month} has 31 days`)
+        break
+    case "November":
+        console.log(`${month} has 30 days`)
+        break
+    case "December":
+        console.log(`${month} has 31 days`)
+        break
+    default:
+        console.log('\n end ' + month)
+        break
+}