Merge pull request #1 from jspmic/krishna

Added krishnamurthy.c in /math/

math/krishnamurthy.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+/*
+
+ * A krishnamurthy number is a number where the sum of 
+ the factorial of its digits is equal to the number itself
+
+ For example, 145 = 1! + 4! + 5!
+ but 13 != 1! + 3!
+
+ * For more information, visit https://www.geeksforgeeks.org/problems/krishnamurthy-number1323/1
+
+*/
+
+
+int factorial(int n){
+    //Simple function returning the factorial of n
+
+    if (n<2){
+	return n;
+    }
+    return n*factorial(n-1);
+}
+
+int get_digit(int n, int sum){
+    // Function returning the sum of the factorial of the digits
+
+    if (n<10){
+	return sum+factorial(n);
+    }
+    else{
+	int div = n/10;
+	sum += factorial(n%10);
+	return get_digit(div,sum);
+    }
+}
+
+void krishnamurthy(int n){
+    int sum=0;
+    if (get_digit(n,sum)==n){
+	printf("%d is a krishnamurthy number\n",n);
+    }
+    else {
+	printf("%d is not a krishnamurthy number\n",n);
+    }
+}
+
+int main(){
+    int n = 13, x = 145;
+    printf("For example: \n");
+    krishnamurthy(n);
+    krishnamurthy(x);
+    return 0;
+}
+