diff --git a/Concatination_ofString_Python b/Concatination_ofString_Python
new file mode 100644
index 0000000..80cb85e
--- /dev/null
+++ b/Concatination_ofString_Python
@@ -0,0 +1,3 @@
+Str1=input("Enter the String1 to be concatenated")
+Str2=input("Enter the String2 to be concatenated")
+print(Str1+Str2)
diff --git a/Concatination_ofStrings_Python b/Concatination_ofStrings_Python
new file mode 100644
index 0000000..80cb85e
--- /dev/null
+++ b/Concatination_ofStrings_Python
@@ -0,0 +1,3 @@
+Str1=input("Enter the String1 to be concatenated")
+Str2=input("Enter the String2 to be concatenated")
+print(Str1+Str2)
diff --git a/binary_decimal b/binary_decimal
new file mode 100644
index 0000000..eb14b6d
--- /dev/null
+++ b/binary_decimal
@@ -0,0 +1,19 @@
+#include <stdio.h>
+ 
+void main()
+{
+    int  num, binary_val, decimal_val = 0, base = 1, rem;
+ 
+    printf("Enter a binary number(1s and 0s) \n");
+    scanf("%d", &num); /* maximum five digits */
+    binary_val = num;
+    while (num > 0)
+    {
+        rem = num % 10;
+        decimal_val = decimal_val + rem * base;
+        num = num / 10 ;
+        base = base * 2;
+    }
+    printf("The Binary number is = %d \n", binary_val);
+    printf("Its decimal equivalent is = %d \n", decimal_val);
+}
diff --git a/factorial b/factorial
new file mode 100644
index 0000000..b58a9cf
--- /dev/null
+++ b/factorial
@@ -0,0 +1,42 @@
+import java.util.*;
+class FCTRL{
+static int product(int x,int arr[],int len)
+{
+	int carry=0;
+	for(int i=0;i<len;i++)
+	{
+		int prod=arr[i]*x+carry;
+		arr[i]=prod%10;
+		carry=prod/10;
+	}
+	while(carry!=0)
+	{
+		arr[len]=carry%10;
+		carry=carry/10;
+		len++;
+	}
+	return len;
+}
+static void factorial(int n)
+{
+	int arr[]=new int[5000];
+	arr[0]=1;
+	int len=1;
+	for(int x=2;x<=n;x++)
+		len=product(x,arr,len);
+	for(int i=len-1;i>=0;i--)
+		System.out.println(arr[i]);
+}
+public static void main(String args[])
+{
+    try{
+	Scanner sc=new Scanner(System.in);
+	int test=sc.nextInt();
+	for(int i=1;i<=test;i++)
+	{
+		int a=sc.nextInt();
+		factorial(a);
+	}}
+	catch(exception e){
+        return ;}
+}}