Category: Java Interview
For each character we have predefined ASCII numbers:
| Find ASCII Value of a character in Java |
package JavaQuestions;
/**
*
* @author NaveenKhunteta
*
*/
public class AsciiChar {
public static void main(String[] args) {
char c = ‘a’; // 97
int ascii = c;
int asciiNumber = (int) c;
System.out.println(“ASCII value of “ + c + “:”+ ascii);
System.out.println(“ASCII value of “ + c + “:”+ asciiNumber);
}
}
Output is:
ASCII value of a:97
ASCII value of a:97
| Multiply two Floating Point Numbers in Java |
package JavaQuestions;
/**
*
* @author NaveenKhunteta
*
*/
public class FloatingMultiplication {
public static void main(String[] args) {
float f1 = 2.5f;
float f2 = 3.5f;
System.out.println("the product is: " + (f1 * f2));
}
}
Output:
the product is: 8.75
This is very simple, just define two integer variables and use + operator to add them.
package JavaQuestions;
/**
*
* @author NaveenKhunteta
*
*/
public class AddNumbers {
public static void main(String[] args) {
int a = 10;
int b = 20;
int sum = a + b;
System.out.println("sum of a and b is: " + sum);
}
}Output:
sum of a and b is: 30
Print an Integer – entered by user from console/command line
package JavaQuestions;
import java.util.Scanner;
/**
*
* @author NaveenKhunteta
*
*/
public class PRintImnteger {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
System.out.println("plz enter a number: ");
int num = reader.nextInt();
System.out.println("you entered: " + num);
}
}Scanner class is a default class which is coming from java.util package. It is used to take the user input from the console.
Example:
plz enter a number:
10
you entered: 10
How to find Armstrong Number
Learn:
1. check the given number is Armstrong or not.
2. write different test cases for Armstrong Number
Code:
package Questions;
public class ArmstrongNumber {
//153
//1*1*1 = 1
//5*5*5 = 125
//3*3*3 = 27
//1+125+27 = 153
//407 == 4*4*4 + 0 + 7*7*7 = 407
//0
//1 == 1*1*1 = 1
//370, 371
public static void isArmstrongNumber(int num){
//153 == 1*1*1 5*5*5 3*3*3
System.out.println(“given number is “+ num );
int cube = 0;
int r;
int t;
t=num;
while(num>0){
r = num%10;
num = num/10;
cube = cube+(r*r*r);
}
if(t==cube){
System.out.println(“this is an armstrong number”);
}else{
System.out.println(“this is not an armstrong number”);
}
}
public static void main(String[] args) {
isArmstrongNumber(153);
isArmstrongNumber(370);
isArmstrongNumber(0);
isArmstrongNumber(1);
isArmstrongNumber(455);
}
}
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