Merge pull request ZoranPandovski#23 from jebinphilipose/update-readme

Add Implementation of Strong number and Update README.md accordingly

README.md

@@ -17,6 +17,7 @@ Clean examples implementations of data structures and algorithms written in diff
   * [russian peasant](math/russian_peasant)
   * [towers_of_hanoi](math/towers_of_hanoi)
   * [armstrong_number](math/armstrong_number)
+  * [strong_number](math/strong_number)
 * [Cryptography](cryptography)
   * [caesar cipher](cryptography/caesar_cipher)
   * [substitution cipher](cryptography/substitution_cipher)

math/strong_number/C/strong.c

@@ -0,0 +1,23 @@
+#include<stdio.h>
+
+int fact(int x)
+{
+	if(x > 1)
+		return x*fact(x-1);
+	else return 1;
+}
+
+int main(void)
+{
+	int n, t, s=0, r;
+	printf("Enter the number: ");
+	scanf("%d", &n);
+	t=n;
+	while(t>0)
+	{
+		r = t % 10;
+		t = t / 10;
+		s = s + fact(r);
+	}
+	(s == n) ? printf("\nThis is a strong number") : printf("\nThis is not a strong number");
+}

math/strong_number/README.md

@@ -0,0 +1,9 @@
+### Strong number
+
+Strong Numbers are the numbers whose sum of factorial of digits is equal to the original number. Given a number, check if it is a Strong Number or not.
+
+#### Example:
+
+Input : 145 <br/>
+Output : This is a strong number <br/>
+1! + 4! + 5! = 145