Odd or Even

package com.tutorial4u;

import java.util.Scanner;

public class OddorEven {

       public static void main(String[] args) {

             System.out.println("Enter an Integer to check if it is odd or even.");

             Scanner sc = new Scanner(System.in);

             int num = sc.nextInt();

             if(num%2==0){

                    System.out.println("Entered number is even. ");

             }else{

                    System.out.println("Entered number is odd. ");

             }

       }

}

Output : 

Enter an Integer to check if it is odd or even.

24

Entered number is even.

Addition of Two Number

package com.tutorial4u;

import java.util.Scanner;

public class Addition {

     public static void main(String[] args) {

           int a, b, c;

           Scanner sc = new Scanner(System.in);

           System.out.print("Ener value of a : ");

           a = sc.nextInt();

           System.out.print("Enter value of b : ");

           b = sc.nextInt();

           c = a + b;

           System.out.println("Added Value of a and b is : " + c);

     }

}

Output :

Ener value of a : 13

Enter value of b : 34

Added Value of a and b is : 47

Print Multiplication of a Table

package com.tutorial4u;

import java.util.Scanner;

public class MutiplicationsOfTable {

     public static void main(String[] args) {

           int num;

           Scanner sc = new Scanner(System.in);

           System.out.print("Enter a Number to prints its table : ");

           num = sc.nextInt();

           System.out.println("Multiplication of table " + num + " is : ");

           for (int i = 1; i <= 10; i++) {

                System.out.println(num + "*" + i + "=" + (num * i));

           }

     }

}

Output :

Enter a Number to prints its table : 5

Multiplication of table 5 is :

5*1=5

5*2=10

5*3=15

5*4=20

5*5=25

5*6=30

5*7=35

5*8=40

5*9=45

5*10=50

HelloWord

class HelloWord 
{
 public static void main(String[] args) 
 {
  System.out.println("Hello World!");
 }
}

Reverse of string

Reverse of string

/******************************************************
                  Reverse of string   
*******************************************************/
#include< stdio.h>
#include< conio.h>
#include< string.h>
void main()
{
 char str[100],temp;
 int i,j=0;
 clrscr();
 printf("Enter any the string :");
 gets(str);  //  gets function for input string
 i=0;
 j=strlen(str)-1;
  while(i < j)
   {
   temp=str[i];
   str[i]=str[j];
   str[j]=temp;
   i++;
   j--;
   }
 printf("Reverse string is :%s",str);
 getch();
}

Output

Enter any the string  : hitesh
Reverse string is : hsetih

Explanation Of Program :

Firstly find the length of the string using library function strlen().

j = strlen(str)-1;

Suppose we accepted String "hitesh" then

j = strlen(str)-1;
  = strlen("hitesh") - 1
  = 7 - 1
  = 6

As we know String is charracter array and Character array have character range between 0 to length-1. Thus we have position of last character in variable 'j'.Current Values of 'i' and 'j' are :

i = 0;
j = 6;

'i' positioned on first character and 'j' positioned on last character. Now we are swapping characters at position 'i' and 'j'. After interchanging characters we are incrementing value of 'i' and decrementing value of 'j'.

while(i < j)
     {
     temp   = str[i];
     str[i] = str[j];
     str[j] = temp;
     i++;
     j--;
     }

If i crosses j then process of interchanging character is stopped.

Compare of Two String.

Compare Two Strings

To compare any two string first we need to find length of each string and then compare both strings. If both string have same length then comapre character by character of each string.

/*******************************************************
            Compare Two Strings
********************************************************/
#include< stdio.h>
#include< conio.h>
void main()
 {
 char str1[20],str2[20],i,j,flag=0;
 clrscr();
 printf("Enter first string: ");
 gets(str1);
 printf("Enter Second string: ");
 gets(str2);
 i=0;
 j=0;
  while(str1[i]!='\0')
  {
   i++;
  }
  while(str2[j]!='\0')
  {
   j++;
  }
 if(i!=j)
 {
 flag=0;
 }
 else
 {
 for(i=0,j=0;str1[i]!='\0',str2[j]!='\0';i++,j++)
 {
 if(str1[i]==str2[j])
 {
 flag=1;
 }
 }
 }
 if(flag==0)
 {
 printf("Strings are not equal");
 }
 else
 {
 printf("Strings are equal");
 }
 getch();
}

Output

Enter First String : rajess
Enter Second String : rajesh
Strings are not equal

Count Length of String..

Count Length of String

Count Length of String is nothing but just count number of character in the given String. For Example: String="India" in this string have 5 characters also this is the size of string.

Count length of String without using any library function.

/**************************************************
              Count length of String
***************************************************/
#include< stdio.h>
#include< conio.h>

 void main()
  {
   int i,count=0;
   char ch[20];
   clrscr();
   printf("Enter Any String: ");
   gets(ch);
   for(i=0;ch[i]!='\0';i++)
   {
   count++;
   }
   printf("Length of String: %d",count);
   getch();
  }

Output

Enter any String: hitesh
Length of String: 6

Explanation of Code

Here gets() is a predefined function in "conio.h" header file, It recevie a set of character or String from keyboard.

for(i=0;ch[i]!='\0';i++)
   {
   count++;
   }

Here we check the condition ch[i]!='\0' its means loop perform until string is not null, when string is null loop will be terminate.

Count length of String Using Library Function

/**************************************************
             Count length of String
***************************************************/

#include< stdio.h>
#include< string.h> 
 int main()
  {
   char str[20];
   int length;
   printf("Enter any string: ");
   gets(str);
   length = strlen(str);
   printf("Length of string: %d",length);
   return 0;
}

Output

Enter any String: Kumar
Length of String: 5

Explanation of Code:

• Here gets() is a predefined function in "conio.h" header file, It recevie a set of character or String from keyboard.
• strlen() is a predefined function in "conio.h" header file which return length of any string.

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