Sum

DailyCodingProblem/src/Mathematics/SumOfNaturalNumber.java

@@ -0,0 +1,31 @@
+package Mathematics;
+
+import java.util.Scanner;
+
+public class SumOfNaturalNumber {
+
+	public static int calculateSum(int num) {
+
+		return (num*(num+1)/2);
+	}
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner sc=new Scanner(System.in);
+
+		System.out.print("Enter the positive interger number : " );
+		int n=sc.nextInt();
+
+		if(n<0) {
+			System.out.println("Invalide Integer ! ");
+		}
+		else {
+
+			int sum=calculateSum(n);
+			System.out.println("Sum of first " + n + " natural number is : " + sum);
+		}
+
+
+	}
+
+}