Java tutorial: Practice Questions on Loops

Java practice questions on loops, break and continue: This video will talk about loops practice questions in java. Here we will practice about different types of loops used to control the flow of a program in Java

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[DroidHolicOfficial]

Another way of solving the first problem -

//This for loop is for each line
for (int i = 0; i < 4; i++) {
//This for loop is to print some number of stars in one line
for (int j = i; j<4; j++) {
System.out.print("*");
}
System.out.print("\n");
}



E.g. When i =0, j = 0 as well. So, since 0 < 4 is true in 2nd loop, the "*" is printed 4 times (0, 1, 2, 3).
Then after the 2nd loop ends, newline is printed and the first iteration of the first loop ends.

Now, i = 1 so j = 1 as well. 1 < 4. So "*" is printed thrice (1, 2, 3);

Then i = 2 so j = 2 as well. 2 < 4. So "*" is printed twice (2, 3);

Finally, i = 3 so j = 3 and 3 < 4. So "*" is printed once (3).'

After this, when i = 4, the condition (i < 4 ) is false hence the loop ends.



The SImplest way to start writing code for this problem is by starting with how we print one star -

--> System.out.print("*");

Now, how to print a 4 stars in one line? We will use a loop for that.

---> for (int j = 0; j<4; j++) {
System.out.print("*");
}

Now, how can we do the same in 4 different lines. This means we need to run the above loop 4 times. So we need to put it inside another loop.

----> for (int i = 0; i < 4; i++) {
for (int j = 0; j<4; j++) {
System.out.print("*");
}
}

But when we run this, all the stars will be printed in one line. That's because after we print 4 starts in one line, we need to add a new
line

---> for (int i = 0; i < 4; i++) {
for (int j = 0; j<4; j++) {
System.out.print("*");
}
System.out.print("\n");
}

Now we see that there are 4 lines with each line having 4 stars. Each line has four stars because no matter how many times the loop 1 iterates, in every iteration, the "j" starts with an initial value of 0.

So the simple solution is to set "j = i" in the 2nd loop instead of "j = 0" because in that way, with every new iteration, the 2nd loop gets the current value of i & then sets the value of "j" accordingly instead of us hardcoding its value to 0;

PS: TRIED MY BEST TO MAKE IT SIMPLE TO UNDERSTAND xD

[arijeetkumar]

Entire Java course is going nice.
Thanks for providing these helpful courses at free of cost.

[RohanDasRD]

These practice Programs are really useful for us

[sagarbhadre]

6:17 sum of the even numbers using while loop:


public class Main
{
public static void main (String[]args)
{
int sum = 0;
int n = 4;
int i = 0;

while (i < n)
{
sum = sum + (2 * i);
i++;
}
System.out.println
("the sum of the first 4 even numbers using while loop is below");
System.out.print (sum);

}

}

[Lila]

Ads - whitehat jr
But me -- THE LEGEND HARRY

[joybrar]

This is honestly the most fun I've had while studying, I love this course and the questions are amazing :D <3

[motivationalquotes]

I'm feeling lucky because I don't even thought of learning programming in such a fun way, and practice sets are cherry on the top.

[shivanklohiya]

Question 11 using while loop first n even number sum is :
int sum = 0;
int i = 0;
int n = 5;
while (i<n) {
sum = sum +(2* i);
i++;
}
System.out.println("sum of even number is :");
System.out.println(sum);

[Piyush-menu]

5:03 here we can also use,
public class Practise_Q17 {
public static void main(String[] args) {
String str= "*";
for( int i= 4;i<5 && i!=0;i--){

}
}
}

[prajwalitsinghraja]

Solution of every Q is given below...👇

import java.util.Scanner;


public class CWH_Ch5_PS {
public static void main(String[] args) {
// Question 1

for (int a = 4; a>0; a--){
for (int b = 0; b<a; b++){
System.out.print("*");
}
System.out.print("\n");
}

// Question 2

int c = 0;
int sum = 0;
while(c<6){
System.out.println(2*c);
sum = sum+(2*c);
c++;
}
System.out.println("The sum of these numbers is: " + sum);

// Question 3

Scanner multi;
multi = new Scanner(System.in);
System.out.println("Enter the number");
int no = multi.nextInt();
int cons = 1;
System.out.printf("Table of %d\n", no);
while (cons<11){
System.out.printf("%d x %d = %d \n", no, cons, no*cons);
cons++;
}

// Question 4

System.out.println("Reverse Table of 10");
int reNo = 10;
int reCons = 10;
while (reCons>0){
System.out.printf("%d x %d = %d \n", reNo, reCons, reNo*reCons);
reCons--;
}

// Question 5

int num = 5;
int fact = 1;
for (int i = 1; i<=num; i++){
System.out.println(num*i);
fact *= i;
}
System.out.printf("Factorial = %d \n", fact);

// Question 6

int x = 5;
int y = 25;
while(y>x){
System.out.println(x);
y--;
}

// Question 7

for (int z = 0; z<20; z++){
System.out.println(1);
}

// Question 9
int newSum = 0;
int newNo = 8;
int newCons = 1;
// System.out.printf("Table of %d\n", newNo);
while (newCons<11){
// System.out.printf("%d x %d = %d \n", newNo, newCons, newNo*newCons);
newSum += newNo*newCons;
newCons++;
}
System.out.println("The Sum Of Numbers In Table Of 8 Is: " + newSum);

// Question 11

for (int p = 0; p<20; p++){
System.out.println(2);
}
}
}

[sursangeetujjain]

00:20:09 -

problem - 7 -
/* Q. 7 - Solve Q.1 Using while loop */
int n = 4;
int i = 0;

while (i<n)
{
int j = 0;
while (j < n - i)
{
System.out.print("*");
j++;
}
System.out.println("\n");
i++;
}

[Jainil-yqfc]

another way to solve first problem:-
public static void main(String[] args){
int n=10;
for (int i=0;i<n;i++){


for (int j=i;j<n;j++){
System.out.print("*");
}
System.out.print("\n");}
//jkdcode

[crescent]

9:00 by using while loop

int i = 0;
int sum = 0;
int n = 3;

while (i<=n)
{
sum = sum + 2*i;
i++;
};
System.out.print("the sum is ");
System.out.println(sum);

[mohammadtufailahmad]

Bohot maza aaya Harry bhai practice set me... Question no 1 Star problem ko solve krte waqt to mujhe to sach me taare dikhne lage the😂😂... Phir 1 din baad aaj aapki ye video dekh kr usko banana seekh gya... Thank you so much, brother! May Allah bless you!

[zaid]

Kids: Carry
Men: Marry
Legends: Harry 👌

[Rajgour]

Hi Harry,
First of all Thank you so much for a systematic tutorials.
and Thanks Ayush, who recommend me to study from your tutorial.
You know I am a mechanical engineer(passed in 2014) and now I have decided to learn java after waste of my 6 years. and really it is shocking, I have understand all concept because of your tutorial.
You are really a great teacher.
I have some basic idea about that but now I have cleared my all doubts.

Thank you so much!!!

[anshdholakia]

---- Answers ---

Question 7: 1 in while loop:
int i=4;
while(i>=0){
int j=i;
while(j>0){
System.out.print("* ");
j--;
}
System.out.println();
i--;
}

question 10: question 2 in while loop:

Scanner scan=new Scanner(System.in);
System.out.println("Enter the maximum limit of numbers: ");
int n=scan.nextInt();
int i=0;

while(i<=n){
sum+=(i*2);
i++;
}
System.out.println("Sum: "+sum);

[sauravpatil]

This playlist is useful even after 6-7 years, thanks for all your efforts, no words to describe your efforts, you are the hero for the new programmers 🙏🙏🙏🙏🙏😎😎😎

[manmohansingh]

Harry bhai thanks for the amazing practice set. It gave me a lot of understanding about practical usage of for loops .Maza aa gaya problems dekh kar👌✌

[snehalhsambrekar]

Before u solve these problems, , , I solved it confidently, , , because, I learnt c and c++ from your Playlist and now java as well with u, ,,, your amazing thanks a ton ..🎉❤..