for loop:

A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times
A for loop is useful when you know how many times a task is to be repeated.
The syntax of a for loop is:

for (initialization; test condition; increment / decrement expression) {
    //Statements
}

class SwitchDemo1 {
    public static void main(String args[]) {
        for (int i = 0; i < 10; i++) {
            switch (i) {
                case 0:
                case 1:
                case 2:
                    System.out.println("Tapuuu");
                    break;
                case 3:
                case 4:
                case 5:
                    System.out.println("Silan Software");
                    break;
                default:
                    System.out.println("Silan");
            }
        }
    }
}

Output
Tapuuu
Tapuuu
Tapuuu
Silan Software
Silan Software
Silan Software
Silan
Silan
Silan
Silan

Here is the flow of control in a for loop:

  • The initialization step is executed first, and only once. This step allows you to declare and initialize any loop control variables. You are not required to put a statement here, as long as a semicolon appears.
  • Next, the Boolean expression is evaluated. If it is true, the body of the loop is executed. If it is false, the body of the loop does not execute and flow of control jumps to the next statement past the for loop.
  • After the body of the for loop executes, the flow of control jumps back up to the update statement. This statement allows you to update any loop control variables. This statement can be left blank, as long as a semicolon appears after the Boolean expression.
  • The Boolean expression is now evaluated again. If it is true, the loop executes and the process repeats itself (body of loop, then update step, then Boolean expression). After the Boolean expression is false, the for loop terminates.

Example

class Test {
    public static void main(String args[]) {
        for (int x = 10; x < 20; x = x + 1) {
            System.out.print("value of x : " + x);
            System.out.print("\n");
        }
    }
}

//Output value of x : 10
value of x : 11
value of x : 12
value of x : 13
value of x : 14
value of x : 15
value of x : 16
value of x : 17
value of x : 18
value of x : 19

// here is another simple example to find the factorial of a number.

import java.util.Scanner;
class Factorial {
    public static void main(String args[]) {
        int n, fact = 1;
        Scanner s = new Scanner(System.in);
        System.out.println("enter the number");
        n = s.nextInt();
        for (int i = 1; i <= n; i++) {
            fact = fact * i;
        }
        System.out.println("the factorial is" + fact);
    }
}

//Output enter the number
4
the factorial is24

write a program to create a Fibonacci series

import java.util.Scanner;
class Fibonacci {
    public static void main(String args[]) {
        int n, i, a, b, c;
        Scanner s = new Scanner();
        System.out.println("enter the value of n");
        n = s.nextInt();
        a = 0;
        b = 1;
        System.out.print(a);
        System.out.print(b);
        for (i = 1; i < n - 1; i++) {
            c = a + b;
            a = b;
            b = c;
            System.out.print(c);
        }
    }
}

 

Output
enter the value of n
6
011235

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