for loop in java

ORGANIZED BY MAJID JHATIAL
JAVA PROGRAMMER
My majid2936@gmail.com
Only for loop exercise and a lot of example in
For loop
Coming soon upload while-loop do-while loop

LOOP REPETITION STATEMENTS
Repetition of statements allow us to
execute a statements multiple time.
Java has three kinds repetition
statements
1 for loop
2 While loop
3 Do-while loop

WHAT IS FOR LOOP ?
For loop is also known as counter loop
There are three part of for loop.
following syntax:
For(initialization ,condition; increment )
1 Initialization is executed once before the loop
begins
2 The statement is executed until the condition
becomes false
3 The increment portion is executed at the end of each
teration

THE FOR STATEMENTS
Example for loop
For(int count=1 ;count<=5; count++){
System.out.println(count);
}
1 Initialization section can be declare the variable
2 Increment section can be performed any calculation
for (int num=100; num > 0; num -= 5){
System.out.println (num);
}

INFINITE LOOP
For example infinite loop
for(int count=1; count<=14; i--){
System.out.println(count);
}
Infinite loop will continue execute until interrupter
(Ctrl-c)

ENDING LOOPING PROGRAM
Break
Break statements result in the terminate of
statements .which applies(Do-while,for,while, switch) . The
break statements gets you out of loop. No meter what the
loop e ending condition. Break immediately says. I am out
here.
Continue
continue skips the statements after the continue
statement and keeps looping.
Continue perform a jump to the next test condition in a loop
the condition statement may be used only in iteration
statements (loop)

THE BREAK
Break example in for loop syntax
for(int i=1; i<=30; i++){ output : 1,2,3
if(i==3){
break;
}
System.out.println(i);
}
Int count=0;
for(int i=1; i<=30; i++){
if(i==16){
break;
}
count++;
}
System.out.println(“Totle=”+count);

CONTINUE EXAMPLE
for(int count=1; count<=30; i++){
if(count==13){
continue;
}
System.out.print(count);
}
int a=0;
for(int count=1; i<=22; count++){
if(count==13){
continue;
}
System.out.oprintln(count);
a++;
}
System.out.println(a);

FIBONACCI SERIES
Enter number 5 then output 1,1,2,3
Scanner ob=new Scanner(System.in);
System.out.println(“Enter the number”);
int i,a=0,b=1,c=0;
int num=ob.nextInt();
for( i=1; i<=num; i++){
System.out.println(c);
a=b;
b=c;
c=a+b;
}

FACTORIAL SERIES
Example factorial number and enter the 5 number t then
output 120..
Scanner bo = new Scanner(System.in);
System.out.println(“Enter the number”);
int fact=1;
int num = ob.nextInt();
for(int i=1; i<=num; i++){
fact=fact*i;
System.out.println(“this factorial number ”+fact);
}

PRIME NUMBER
int n;
int status = 1, num = 3;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the value of n:");
n = scanner.nextInt();
if (n >= 1) {
System.out.println("First "+n+" prime numbers are:");
System.out.println(2); }
for ( int i = 2 ; i <=n ; ) {
for ( int j = 2 ; j <= Math.sqrt(num) ; j++ ) {
if ( num%j == 0 ) {
status = 0;
break; }
}
if ( status != 0){
System.out.println(num);
i++; }
status = 1;
num++; }

NEST FOR LOOP
For loop inside for loop is called nested for loop
A for loop can contain any kind of statement in its body,
including another for loop.
follow syntax
for( outer ){
for(inner){
}
for(----; ---; ){
}
}
practice nest loop

PATRICE NEST LOOP SAME EXAMPLE
class Test{
public static void main(String arg[]){
for(int i=1 ; i=4; i++ ){
f(int j=1; j<=4; j++ ){
}// inner loop close
System.out.println(j);
}// outer loop close;
}
}
another example
for(int i=2 i<5; i++ ){
for(int j=i; j<=5; j++){
}
System.out.println();
}

for( int i=1; i<=10 ; i++){
for(int j=1; j<10; j++ ){
j++;
}
}
for( int i=1; i<=10 ; i++){
for(int j=1; j>10; j++ ){
j++;
}
}
for( int i=1; i>=10 ; i--){
for(int j=1; j<10; j++ ){
j++;
}
}

Nested for loop exercise
What is the output of the following nested for
loop?
for (int i = 1; i <= 6; i++) {
for (int j = 1; j <= i; j++) {
System.out.print("*");
}
}
Output:
*
**
***
****
*****
******
for (int i = 1; i <= 6; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(i);
}
}
Output?

What is the output of the following nested for loops?
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= (5 - i); j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print(i);
}
}
Answer:
1
22
333
4444
55555

This loop repeats 10 times, with i from 1 to 10.
for (int i = 1; i <= 10; i++) {
for (int j = 1; j <= 5; j++) { // loop goes 5 times
System.out.print(j); // print the j
}
}
Better:
// Prints 12345 ten times on ten separate lines.
for (int i = 1; i <= 10; i++) {
for (int j = 1; j <= 5; j++) {
System.out.print(j);
}
System.out.println(); // end the line of output
}

for loop in java

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