Devops

AP1403 - WarmUp/src/main/java/Exercises.java

@@ -1,10 +1,35 @@
+import java.util.Scanner;
+
 public class Exercises {
 
     /*
         complete this function to check if the input number is prime or not
      */
     public boolean isPrime(long n) {
-        // todo
+        int i;
+        int m = 0;
+        int flag = 0;
+        System.out.println("Enter your number : ");
+        Scanner scanner = new Scanner(System.in);
+        byte number = scanner.nextByte();
+        i = 2;
+        m = number / 2 ;
+        if(number == 0 || number == 1){
+            System.out.println("it is not prime.");
+        }
+        else{
+             while (i <= m) {
+                if (number % i == 0) {
+                    System.out.println("it is not prime.");
+                    flag = 1;
+                    break; 
+                }
+                i++;
+             }
+             if (flag == 0) {
+                System.out.println("it is prime.");
+             }
+        }
         return false;
     }
 
@@ -15,8 +40,23 @@ public boolean isPrime(long n) {
         if the input is not a fibonacci number with description above, return -1
      */
     public long fibonacciIndex(long n) {
-        // todo
-        return -1;
+        int number;
+        System.out.print("enter your number : ");
+        Scanner scanner = new Scanner(System.in);
+        n = scanner.nextLong();
+        if(n < 0){
+            return -1 ;  // اعدادی که منفی هستند در دنباله ی فیبوناچی وجود ندارند
+        }
+        int a = 0 ;
+        int b = 1;
+        int index = 0 ;
+        while (b < n) {
+            int temp = b ;
+            b = a + b ;
+            a = temp ;
+            index++ ;
+        }
+        return b == n ? index : -1 ;
     }
 
     /*
@@ -37,12 +77,41 @@ public long fibonacciIndex(long n) {
 
         the output has to be a two-dimensional array of characters, so don't just print the triangle!
      */
-    public char[][] generateTriangle(int n) {
-        // todo
-        return null;
+    public static char[][] generateTriangle(int n) {
+        if (n <= 0) {
+            return new char[0][0] ;
+        }
+        char [][] triangle = new char[n][n];
+        for(int i = 0 ; i < n ; i++){
+            for(int j = 0 ; j < n ; j++){
+                if (j <= i) {
+                    triangle[i][j] = '*';
+                }
+                else{
+                    triangle[i][j] = ' ';
+                }
+            }
+        }
+        return triangle ;
+    }
+
+
+    public static void printTriangle(char[][]triangle) {
+        for(char[] row : triangle){
+            for(char c : row){
+                System.out.print(c);
+            }
+            System.out.println();
+        }
     }
 
     public static void main(String[] args) {
         // you can test your code here, but then it should be checked with test cases
+        // start testing 
+        System.out.print("enter your number : ");
+        Scanner scanner = new Scanner(System.in);
+        int number = scanner.nextInt();
+        char[][] trianglenumber = generateTriangle(number);
+        printTriangle(trianglenumber);
     }
-}
+}