For loop in Java;
In this section let's see about for loop in java.
Syntax:
- For loop contains three parts initialization, condition and increment/decrement.
- Initialization part executes only once.
- Condition part will define the condition for the execution of code block.
- All the three parts of for loop are optional.
Example 1:
class Easy
{
public static void main(String[] args)
{
for (int i = 1; i <5; i++)
{
System.out.println(i);
}
}
}
/ ### Output ###
1
2
3
4
Explaination:
In the above example initialization part initializes the variable i with 1, condition is i less than 5 and at the increment place there is an increment by 1 ,so the output will be 1 to 4.
Example 2:
Example 1 can also be written like the code below.
class Easy
{
public static void main(String[] args)
{
int i = 1;
for (; i <5; )
{
System.out.println(i);
i++;
}
}
}
/ ### Output ### 1 2 3 4 /
Example 3:
class Easy
{
public static void main(String[] args)
{
//all parts of for loop are optional
for(;;)
System.out.println("Hello");
}
}
### Output ###
Hello
Hello
Hello
Hello
-----
-----
Infinite time Hello
Example 4: Find factorial of any number
//factorial of 5=1x2x3x4x5
//factorial of 6=1x2x3x4x5x6
//factorial of N=1x2x3x....xN
import java.util.Scanner;
class Easy
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
int no,f=1;
System.out.println("Enter any number");
no=in.nextInt();
for (int i = 1; i <=no; i++)
{
f=f*i;
}
System.out.println("The factorial of "+no+" is "+f);
}
}
### Output ###
Enter any number 6
The factorial of 6 is 720
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