In this article, we will learn how to find and remove first & last digit of a number
Find/remove first and last digit of a number :
- Find the first digit of a number
- Find the last digit of a number
- Remove the first digit from a number
- Remove the last digit from a number
1. Find the First digit of a number :
- Note: The modulo operator gives the remainder after division
- Iterate the given number till it becomes zero using while–loop
- Inside while–loop,
- Perform modulo operation and store this value as remainder
- And at the same time, divide the given number which will return quotient which will be checked for while–loop condition
- When while-loop breaks, the value stored in the remainder is the first digit
- Print first digit to the console
FindFirstDigit.java
package in.bench.resources.arrays.find.number;
public class FindFirstDigit {
public static void main(String[] args) {
// 1. integer number
int number = 54869;
System.out.println("Original Number is :- \n" + number);
// 2. find first digit using Modulo
int remainder = 0;
while(number != 0) {
remainder = number % 10;
number /= 10;
}
// 3. print to console
System.out.print("\nFirst Digit is :- \n" + remainder);
}
}
Output:
Original Number is :-
54869
First Digit is :-
5
2. Find the Last digit of a number :
- The modulo operator gives the remainder after division
- n modulo 10 provides a last digit of n
- For example, (1234 % 10) => 4 as shown in the below illustration
FindLastDigit.java
package in.bench.resources.arrays.find.number;
public class FindLastDigit {
public static void main(String[] args) {
// 1. integer number
int num = 1254;
System.out.println("Original Number is :- \n" + num);
// 2. find last digit using Modulo
int remainder = num % 10;
System.out.print("\nLast Digit is :- \n" + remainder);
}
}
Output:
Original Number is :-
1254
Last Digit is :-
4
3. Remove the First digit from a number :
- Convert the given integer/number into String using toString() method
- Use String‘s substring() method to get String leaving first character
- Now, convert String to Integer/number using Integer.parseInt() method
RemoveFirstDigit.java
package in.bench.resources.arrays.find.number;
public class RemoveFirstDigit {
public static void main(String[] args) {
// 1. integer number
int number = 54869;
System.out.println("Original Number is :- \n" + number);
// 2. find first digit using Modulo
int firstDigit = Integer.parseInt(Integer.toString(number).substring(1));
// 3. print to console
System.out.print("\nAfter removing first Digit from a number is :- \n" + firstDigit);
}
}
Output:
Original Number is :-
54869
After removing first Digit from a number is :-
4869
4. Remove the Last digit from a number :
- The divide operator gives the Quotient after division
- n divide 10 provides the value removing the last digit of a number n
- For example, (1234 / 10) => 123 as shown in the below illustration
RemoveLastDigit.java
package in.bench.resources.arrays.find.number;
public class RemoveLastDigit {
public static void main(String[] args) {
// 1. integer number
int num = 1254;
System.out.println("Original Number is :- \n" + num);
// 2. remove last digit using divide operator
int quotient = num / 10;
System.out.print("\nAfter removing last Digit from a number is :- \n"
+ quotient);
}
}
Output:
Original Number is :-
1254
After removing last Digit from a number is :-
125
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Happy Coding !!
Happy Learning !!
