Identify the errors in the following programs. public class Test { public static void main(String[] args) { System.out.println(method2(3.4)); } public static int method1(int n) { if (n > 0) return 1; else if (n == 0) return 0; else if (n < 0) return -1; }
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Identify the errors in the following programs.
public class Test {
public static void main(String[] args) {
System.out.println(method2(3.4));
}
public static int method1(int n) {
if (n > 0) return 1;
else if (n == 0) return 0;
else if (n < 0) return -1;
}
}
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- What is the “stopping” case for each (what causes the methods to “end”)? How do you guarantee that the methods will “stop” (infinite loop, infinite recursion)? Which method one is “better”? Why? public static int factorialValue(int n) {int ans = 1;for (int i=1; i <=n;i++) {ans = ans *i;}return ans;} public static int recursiveValue(int n) {if (n == 0) {return 1;}else {return n*factorialValue(n-1);}}Write in Java - Make sure the -3 is in the output Write a recursive method called printNumPattern() to output the following number pattern. Given a positive integer as input (Ex: 12), subtract another positive integer (Ex: 3) continually until a negative value is reached, and then continually add the second integer until the first integer is again reached. For this lab, do not end output with a newline.Given the following recursive method: public static int think(int x) { if(x<10) if(x%2!=0) return x; else return 0; else if(x%2!=0) return x%10 + think(x/10); else return think(x/10); } Trace (in details) the calling of the above method with any input from your choice such that the returned value will be 19
- Here is a recursive method: public static int mystery(int n, int i) { if(n == 1) return i; else if(n % 2 == 0) return mystery(n/2, i+1); else return mystery(3*n + 1, i+1); } What is the return value of the following call? mystery(3,0);Manually trace the execution of the following Java code segment: (c) if the following method is declared: public static void drawLine(int num, char ch) { for (int i = 1; i <= num; i++) { System.out.print(ch); } } What does the statement drawLine(10, ‘$’) do?What is wrong in the following method in JAVA?public class Test {public static void main(String[] args) {xMethod(1234567);}public static void xMethod(double n) {if (n != 0) {System.out.print(n);xMethod(n / 10);}}}
- Write a java program as in the next class diagram, such as: SimpleCalc2() method only calls find method. find() method: asks the user to enter two numbers and a math operation like(+,-,*./) and prints the result like (inputs and outputs only)Write a recursive method in java public static long numPaths(int r, int c) which can solve the following scenario: a checker is placed on a checkerboard. What are the fewest moves to get to the upper left corner(0,0)? You can only move sideways or vertically. No diagonal moves. Once you have that calculation, how many different ways are there to get to the upper left corner? this is my code but I am getting stock overflow, I'm not reaching my base case. public static long numPaths(int r, int c) { //base case if (r==0 && c==0 || r==0 || c==0) return 1; else { return numPaths(r, c--) + numPaths(r--, c); } }Java, Rewrite the following iterative method as a recursive method that computes the same thing. Note: your recursive method will require an extra parameter.public int iterative1(int x){int count = 0, factor = 2;while (factor < x){if (x % factor == 0) count++;factor++;}return count;}
- answer should be in java with a easy methodGiven the following recursive method:public static int think(int x) {if(x<10)if(x%2!=0)return x;elsereturn 0;elseif(x%2!=0)return x%10 + think(x/10);elsereturn think(x/10);}Trace (in details) the calling of the above method with any input from your choice such that thereturned value will be 19I have two recursive methods in Java but I want to also implement a test class to see if both of them perform how can I do that? Method 1: Non Tail Recursive public class NonTailRecursiveFactorial { public static long factorial(int n) {if (n == 0) {return 1;}return n * factorial(n - 1);} public static void main(String[] args) {for (int i = 0; i <= 10; i++) {System.out.println(i + "! = " + factorial(i));}}} Method 2: Tail Recursive Method public class TailRecursiveFactorial { public static long factorial(int n) {return factorial(n, 1);} private static long factorial(int n, long accumulator) {if (n == 0) {return accumulator;}return factorial(n - 1, accumulator * n);} public static void main(String[] args) {for (int i = 0; i <= 10; i++) {System.out.println(i + "! = " + factorial(i));}}