//Java Program to count the total number of characters in a string
import java.util.*;
public class CountChars
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
String s; int i;
System.out.println("Enter a String");
s=in.nextLine();
for(i=0;i<s.length();i++)
if(s.charAt(i)=='\0')
break;
System.out.println("The String "+s+" has "+i+" characters");
}
}
Output:
//Java Program to count the total number of characters in a string
import java.util.*;
public class CountChars
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
String s; int i;
System.out.println("Enter a String");
s=in.nextLine();
for(i=0;i<s.length();i++)
if(s.charAt(i)=='\0')
break;
System.out.println("The String "+s+" has "+i+" characters");
}
}
In programming languages, loops are used to execute a set of instructions/functions repeatedly when some conditions become true. There are three types of loops in Java.
| Comparison | for loop | while loop | do while loop |
|---|---|---|---|
| Introduction | The Java for loop is a control flow statement that iterates a part of the programs multiple times. | The Java while loop is a control flow statement that executes a part of the programs repeatedly on the basis of given boolean condition. | The Java do while loop is a control flow statement that executes a part of the programs at least once and the further execution depends upon the given boolean condition. |
| When to use | If the number of iteration is fixed, it is recommended to use for loop. | If the number of iteration is not fixed, it is recommended to use while loop. | If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use the do-while loop. |
| Syntax | for(init;condition;incr/decr){
// code to be executed
}
| while(condition){
//code to be executed
}
| do{
//code to be executed
}while(condition);
|
| Example | //for loop
for(int i=1;i<=10;i++){
System.out.println(i);
}
| //while loop
int i=1;
while(i<=10){
System.out.println(i);
i++;
}
| //do-while loop
int i=1;
do{
System.out.println(i);
i++;
}while(i<=10);
|
| Syntax for infinitive loop | for(;;){
//code to be executed
}
| while(true){
//code to be executed
}
| do{
//code to be executed
}while(true); |
import java.util.*;
class DDA
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int i,j,n;
System.out.println("Enter the Size of the Matrix");
n=in.nextInt();
int a[][]=new int[n][n];
System.out.println("Enter the elements of the Matrix");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
a[i][j]=in.nextInt();
}
System.out.println("The Martix:");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
System.out.print(a[i][j]+" ");
System.out.println();
}
}
}
import java.util.*;
class Sum_Array
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int N,i,sum=0;
System.out.println("Enter the size of the array");
N=in.nextInt();
int arr[]=new int[N];
System.out.println("Enter "+N+" Numbers");
for(i=0;i<N;i++)
{
arr[i]=in.nextInt();
sum=sum+arr[i];
}
System.out.println("The Sum of the elements of the array is: "+sum);
}
}
import java.util.*;
public class Main
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int N,i;
System.out.println("Enter the size of the array");
N=in.nextInt();
int arr[]=new int[N];
System.out.println("Enter "+N+" Numbers");
for(i=0;i<N;i++)
arr[i]=in.nextInt();
System.out.println("The elements of the array are:");
for(i=0;i<N;i++)
System.out.println(arr[i]);
}
}
import java.util.*;
public class Main
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
char ch;
System.out.println("Enter a Character to check whether it is a vowel or a Constant");
ch=in.next().charAt(0);
if(ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u')
System.out.println(ch+" is a Vowel.");
else
System.out.println(ch+" is a Constant.");
}
}
public class Sum
{
public static void main(String args[])
{
int a=10,b=20,sum;
sum=a+b;
System.out.println("Sum= "+sum);
}
}
import java.util.*;
class Min
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int a,b,c,min;
System.out.println("Enter 3 Numbers");
a=in.nextInt();
b=in.nextInt();
c=in.nextInt();
min=Math.min(a,b);
min=Math.min(min,c);
System.out.println("Smallest Number= "+min);
}
}
import java.util.*;
class Diagonal
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
double a,d;
System.out.println("Enter the side of the Square");
a=in.nextInt();
d=Math.sqrt(2)*a;
System.out.println("Side of the Square= "+a);
System.out.println("Diagonal of the Square= "+d);
}
}
/* Question: The final velocity of a vehicle can be calculated by using the formula:
V2=u2+2as;
where u= initial velocity, a=acceleration, s=distance covered
Write a Program in Java to calculate and Display the final velocity by taking initial velocity, acceleration and the distance covered as inputs. */
import java.util.*;
public class Velocity
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int u,a,s;
double v;
System.out.println("Enter the initial Velocity, acceleration and distance covered");
u=in.nextInt();
a=in.nextInt();
s=in.nextInt();
v=Math.sqrt((u*u)+(2*a*s));
System.out.println("Final Velocity = "+v);
}
}
import java.util.*;
class SUM_AVG
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int N,Num,Sum=0,avg;
System.out.println("Enter the Number of Numbers");
N=in.nextInt();
for(int i=1;i<=N;i++)
{
System.out.println("Enter a Number");
Num=in.nextInt();
Sum=Sum+Num;
}
avg=Sum/N;
System.out.println("Sum= "+Sum+"\n"+"Average= "+avg);
}
}
public class Infinite
{
public static void main()
{
for(;;)
System.out.println("Hello World");
}
}
/* Question :-
A class contains 'b' number of boys and 'g' number of girls. On a rainy day, 'ba' number of boys and 'ga' number of girls are absent. Write a program to input the values of 'b', 'g', 'ba' and 'ga'. Calculate and display the following:
(i) Percentage of girls present in the class.
(ii) Percentage of boys present in the class.
[Percentage must be calculated on the total number of Students]
*/
import java.io.*;
class Class
{
public static void main(String args[])throws IOException
{
InputStreamReader read=new InputStreamReader(System.in);
BufferedReader in=new BufferedReader(read);
int b,g,ba,ga;
float per_boys,per_girls;
System.out.println("Enter the number of boys and girls in the class");
b=Integer.parseInt(in.readLine());
g=Integer.parseInt(in.readLine());
System.out.println("Enter the number of boys and girls in the class who were absent");
ba=Integer.parseInt(in.readLine());
ga=Integer.parseInt(in.readLine());
per_girls=(float)(g-ga)/(g+b)*100;
per_boys=(float)(b-ba)/(g+b)*100;
System.out.println("The Percentage of girls Present in the class : "+per_girls+"%");
System.out.println("The Percentage of boys Present in the class : "+per_boys+"%");
}
}
/*
Floyd's Triangle:
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
*/
public class Main
{
public static void main (String[] args)
{
int i,j,p;
for(i=1,p=1;i<=5;i++)
{
for(j=1;j<=i;j++)
{
System.out.print(p+" ");
p++;
}
System.out.println();
}
}
}
import java.util.*;
class Simple_Interest
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
double SI,P,R,T;
System.out.println("Enter The Principal, Rate and Time");
P=in.nextDouble();
R=in.nextDouble();
T=in.nextDouble();
SI=(P*R*T)/100.0;
System.out.println("The Simple Interest= "+SI);
}
}
import java.util.*;
class Vertical
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
String s;
System.out.println("Enter a String");
s=in.nextLine();
for(int i=0;i<s.length();i++)
System.out.println(s.charAt(i));
}
}
// //ILLUSTRATION 1
class NULL_LOOP
{
public static void main(String args[])
{
int i;
for(i=1;i<=10;i--)
System.out.println("Hello");
}
}
/*
//ILLUSTRATION 2
class NULL_LOOP
{
public static void main(String args[])
{
int i;
for(i=1;;i--)
System.out.println("Hello");
}
}
*/
/*
//ILLUSTRATION 3
class NULL_LOOP
{
public static void main(String args[])
{
int i;
for(;;)
System.out.println("Hello");
}
}
*/
import java.util.*;
class Number
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
String s;
System.out.println("Enter a Word or Sentence");
s=in.nextLine();
System.out.println("The Second Digit: "+s.charAt(1));
}
}
/* Armstrong Number: A positive number is called armstrong number if it is equal to the sum of cubes of its digits for example 0, 1, 153, 370, 371, 407 etc.
Let's try to understand why 153 is an Armstrong number.
153 = (1*1*1)+(5*5*5)+(3*3*3)*/
import java.util.*;
class ArmStrong
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int n,n1,d,cube,sum,i;
System.out.println("Enter the size of the array");
n=in.nextInt();
int a[]=new int[n];
System.out.println("Enter "+n+" Numbers");
for(i=0;i<n;i++)
a[i]=in.nextInt();
for(i=0;i<n;i++)
{
n1=a[i];
sum=0;
while(a[i]>0)
{
d=a[i]%10;
cube=d*d*d;
sum=sum+cube;
a[i]=a[i]/10;
}
if(sum==n1)
System.out.println(n1+" is an Armstrong Number");
else
System.out.println(n1+" is not an Armstrong Number");
}
}
}
//Java Program to count the total number of characters in a string import java.util.*; public class CountChars { public static void mai...
