C program to swap two numbers

#include <stdio.h>
#include<conio.h>

void main()
{
   int tval , a, b;

   printf("Enter the first value :\n");
   scanf("%d", &a);
   printf("Enter the second value :\n");
   scanf("%d", &b);

   printf("Before Swapping values are\n a = %d\n b= %d\n",a,b);

   tval = a;
   a    = b;
   b    = tval;

   printf("After Swapping\na = %d\nb = %d\n",a,b);

   getch();
}

Factorial Program in C

#include <stdio.h>
#include<conio.h>
void main()
{
  int numbr, fac = 1, k ;

  printf("Enter a number \n");
  scanf("%d", &numbr);

  for (k = 1; k <= numbr; k++)
{  
   fac = fac * k;
}
  printf("Factorial of %d is  %d\n", numbr, fac);

  getch();
}

C Program for Fibonacci Series

#include<stdio.h>
#include<conio.h>
void main()
{
   int num, a = 0, b = 1, t, c;

   printf("Enter the number of terms\n");
   scanf("%d",&num);

   printf("Fibonacci series upto first %d terms :-\n",num);

   for ( c = 0 ; c < num ; c++ )
   {
      if ( c <= 1 )
         t = c;
      else
      {
         t = a + b;
         a = b;
         b = t;
      }
      printf("%d\n",t);
   }

   getch();
}

C Program to use printf statement

#include<conio.h>
#include<stdio.h>
void main()
{
 printf("Hello Everyone"); // Here we are using printf statement
getch();
}

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Java Factorial Program using Recursion

class FactorialRecusionProgramExample{

static int facto(int a){  
  if (a == 0)  
    return 1;  
  else  
    return(a * facto(a-1));  
 }  
 public static void main(String args[]){
  int i,f=1;
  int num=5;//Number for which we are calculating factorial  
  f = facto(num);  
  System.out.println("Factorial of "+num+" is: "+f);  
 }
} 

Java Factorial Program

class FactorialExampleProg{

public static void main(String args[]){
  int j,f=1;
  int num=5;//Number for which we want to calculate factorial  
  for(j=1;j<=num;j++){  
      f=f*j;  
  }  
  System.out.println("Factorial of "+num+" is: "+f);  
 }
}

Java program to check Prime number

class PrimenumExample{  
 public static void main(String args[]){  
  int j,m=0,f=0;    
  int n=7;//Number which we want to check  
  m=n/2;    
  for(j=2;j<=m;j++){    
   if(n%j==0){    
   System.out.println("Number is not prime");    
   f=1;    
   break;    
   }    
  }    
  if(f==0)    
  System.out.println("Number is prime");    
}  
} 

Java Program to reverse a string

import java.util.*;
 
class RevString
{
   public static void main(String args[])
   {
      String orig, rev = "";
      Scanner in = new Scanner(System.in);
 
      System.out.println("Enter a string you want to reverse :");
      orig = in.nextLine();
 
      int length = orig.length();
 
      for ( int i = length - 1 ; i >= 0 ; i-- )
         rev = rev + orig.charAt(i);
 
      System.out.println("Reverse of string is: "+rev);
   }
}

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