Program:-
public class PracticeSet7V35 {
//Q.1 write a java program to print multiplication table of a number n.
static void mul(int n) {
for(int i=1;i<=10;i++) {
System.out.format("%d * %d = %d \n",n,i,n*i);
}
}
/*Q2. write a program using function to print the following pattern.
*
**
***
****
*/
static void star(int n){
for(int i = 0;i<n;i++){
for(int j = 0;j<i+1;j++){
System.out.print("*");
}
System.out.println();
}
}
//Q3.write a recursive function to calculate sum of first n natural numbers.
/* n + number(n-1)
3 + number(2) = 3 + 2 + number(1) = 3 + 2 + 1 = 6*/
static int number(int n){
if(n==1){
return 1;
}
else{
return n + number(n-1);
}
}
/*Q4.write a program to print the following pattern.
****
***
**
*
*/
static void star_r(int n){
for(int i = n;i>0;i--){
for(int j = 0;j<i;j++){
System.out.print("*");
}
System.out.println();
}
}
//Q5.write a function to print Nth term of fibonacci series using recursion.
static int fibonacci(int n){
if(n==1 || n==2){
return n-1;
}
else{
return fibonacci(n-1) + fibonacci(n-2);
}
}
//Q6.write a function to find average of a set of numbers passed as arguments.
static int Average(int ...arr){
int a = 0;
System.out.print("The entered elements are: ");
for(int element:arr){
System.out.print(element+ ", ");
a += element;
}
System.out.print("\nThe average of set of numbers passed as a argument is: ");
return a;
}
//Q7. Repeat 4 using Recursion.
static void star1(int n ){
if(n>0){
star1(n-1);
for (int i = 0; i <n; i++) {
System.out.print("*");
}
System.out.println();
}
}
//Q8., Repeat 2using Recursion.
static void star2(int n){
if(n>0){
for(int i = 0;i<n;i++){
System.out.print("*");
}
System.out.println();
star2(n-1);
}
}
//Q9.Write a function to convert Celsius temperature into Fahrenheit.
static float temp(float n ){
//float a = 33.8f;
float b =(n * 9/5)+32;
return b;
}
//Q10. Repeat 3 using iterative approach.
static void number1(int n){
int a = 0;
for(int i = 1;i<=n;i++){
a +=i;
}
System.out.println(a);
}
public static void main(String[] args) {
System.out.println("Q1.");
mul(4);
System.out.println("Q2.");
star(4);
System.out.println("Q3.");
int a = 4;
System.out.println("The sum of first "+ a +" natural is: "+number(a));
System.out.println("Q4.");
star_r(4);
System.out.println("Q5.");
//fibonacci series : 0 1 1 2 3 5 8 13 21 34
System.out.println("The tenth number of fibonacci number is"+fibonacci(10)+"\n");
System.out.println("Q6.");
System.out.println(Average(1, 2, 3));
System.out.println("Q7.");
star1(4);
System.out.println();
System.out.println("Q8.");
star2(4);
System.out.println("Q9.");
float x = 45.6f;
System.out.print("Celsius to fahrenheit of "+ x + " is: ");
System.out.println(temp(x)+"\n");
System.out.println("Q10.");
int z =4;
System.out.print("The sum of first "+ z + " natural no is: ");
number1(z);
}
}
