diff --git a/1st Year/09. String Operations/string_fun.py b/1st Year/09. String Operations/string_fun.py
new file mode 100644
index 0000000..cc74cc3
--- /dev/null
+++ b/1st Year/09. String Operations/string_fun.py	
@@ -0,0 +1,48 @@
+## To implement user-defined function for string functions
+def slen(str):
+    count = 0
+    for item in str:
+        count += 1
+    return count
+
+
+def scomp(str_first, str_second):
+    if slen(str_first) != slen(str_second):
+        return False
+
+    for i in range(slen(str_first)):
+        if str_first[i] != str_second[i]:
+            return False
+
+    return True
+
+
+def scat(str_first, str_second):
+    return str_first + str_second
+
+
+if __name__ == "__main__":
+    str1 = input("Enter String 1: ")
+    str2 = input("Enter string 2: ")
+
+    print("Lenght of String 1:", slen(str1))
+    print("Length of String 2:", slen(str2))
+
+    if scomp(str1, str2):
+        print("The strings {}, {} are equal.".format(str1, str2))
+    else:
+        print("The strings {}, {} are not equal.".format(str1, str2))
+
+    print("The concatenated string is: {}".format(scat(str1, str2)))
+
+"""
+Sample output
+Enter String 1: ads
+Enter string 2: asdfsdf
+
+Lenght of String 1: 3
+Length of String 2: 7
+The strings ads, asdfsdf are not equal.
+The concatenated string is: adsasdfsdf
+
+"""
diff --git a/1st Year/10. Bubble Sort/bubble_sort.py b/1st Year/10. Bubble Sort/bubble_sort.py
new file mode 100644
index 0000000..1f962cb
--- /dev/null
+++ b/1st Year/10. Bubble Sort/bubble_sort.py	
@@ -0,0 +1,40 @@
+## Program to implement bubble sort
+
+def bubble_sort(arr):
+    length = len(arr)
+    for i in range(length - 1):
+        for j in range(0, length - i - 1):
+            if arr[j] > arr[j + 1]:
+              ## Swapping the right adjacent number
+                t = arr[j]
+                arr[j] = arr[j + 1]
+                arr[j + 1] = t
+    return arr
+
+
+if __name__ == "__main__":
+    input_arr = []
+    num = int(input("Enter the number of numbers: "))
+    print("Enter the array: ")
+
+    for item in range(0, num):
+        input_arr.append(int(input()))
+
+    print("The given array is : {}".format(input_arr))
+
+    print("Array after bubble sorting is: {}".format(bubble_sort(input_arr)))
+    exit(0)
+
+'''
+Sample output
+Enter the number of numbers: 5
+Enter the array: 
+3
+1
+6
+4
+8
+The given array is : [3, 1, 6, 4, 8]
+Array after bubble sorting is: [1, 3, 4, 6, 8]
+
+'''
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