Create armstrong.cpp

armstrong.cpp

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+// C program to find Armstrong number 
+#include <stdio.h> 
+
+// Function to calculate N raised 
+// to the power D 
+int power(int N, unsigned int D) 
+{ 
+	if (D == 0) 
+		return 1; 
+
+	if (D % 2 == 0) 
+		return power(N, D / 2) 
+			* power(N, D / 2); 
+
+	return N * power(N, D / 2) 
+		* power(N, D / 2); 
+} 
+
+// Function to calculate the order of 
+// the number 
+int order(int N) 
+{ 
+	int r = 0; 
+
+	// For each digit 
+	while (N) { 
+		r++; 
+		N = N / 10; 
+	} 
+	return r; 
+} 
+
+// Function to check whether the given 
+// number is Armstrong number or not 
+int isArmstrong(int N) 
+{ 
+	// Calling order function 
+	int D = order(N); 
+
+	int temp = N, sum = 0; 
+
+	// For each digit 
+	while (temp) { 
+		int Ni = temp % 10; 
+		sum += power(Ni, D); 
+		temp = temp / 10; 
+	} 
+
+	// If satisfies Armstrong condition 
+	if (sum == N) 
+		return 1; 
+	else
+		return 0; 
+} 
+
+// Driver Code 
+int main() 
+{ 
+	// Given Number N 
+	int N = 153; 
+
+	// Function Call 
+	if (isArmstrong(N) == 1) 
+		printf("True\n"); 
+	else
+		printf("False\n"); 
+	return 0; 
+}