Simple Numbers and Series with Nested Loop in C (Part IV)

Simple Numbers and Series with Nested Loop in C (Part IV)

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Magic Numbers : When we added up the digits of a number and

e.g. 19 = 1 + 9 = 10 = 1+ 0 = 1

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//C – Magic Number

#include <stdio.h>

#include <conio.h>

  void main()

      {

           int s=0,m,n,f=0;

           clrscr();

           printf("Enter the number ");

           scanf("%d",&n);

           m=n;

           while(m>9)

              {

                   s=0;

                   while(m!=0)

                        {

                            s=s+m%10;

                            m=m/10;

                        }

                   if(s==1)

                        {

                            f=1;

                            break;

                        }

                   m=s;

              }

           if(f==1)

                   printf("%d  is magic number",n);

           else

                   printf("%d is not magic number",n);

           getch();

      }

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Happy Numbers : 28 = 2² + 8² = 4 + 64 = 68 = 6₂ + 8² =100 =1

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//C – Happy Number

#include <stdio.h>

#include <conio.h>

#include <math.h>

  void main()

      {

           int s=0,m,n,f=0;

           clrscr();

           printf("Enter the number ");

           scanf("%d",&n);

           m=n;

           while(m>9)

              {

                   s=0;

                   while(m!=0)

                        {

                            s=s+pow(m%10,2);

                            m=m/10;

                        }

                   if(s==1)

                        {

                            f=1;

                            break;

                        }

                   m=s;

              }

           if(f==1)

                   printf("%d  is happy number",n);

           else

                   printf("%d is not happy number",n);

           getch();

      }

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Special Number / Krishnamurthy Number : 145 = 1! + 4! + 5! = 145.

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//C – Special Number

#include <stdio.h>

#include <conio.h>

 void main()

  {

    int n,r,s=0,i,f,m;

    clrscr();

    printf("Enter a No : ");

    scanf("%d",&n);

    m=n;

    do

       {

             r=m%10;

             f=1;

             for(i=1;i<=r;i++)

               {

                     f=f*i;

               }

             s=s+f;

            m=m/10;

        }while(m>0);

    if(s==n)

           printf(" %d is a Special No ",n);

    else

           printf("%d is not a Special No ",n);

    getch();

   }

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Sorting the digits of a given number without using array

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//C – Digit Sorting

#include <stdio.h>

#include <conio.h>

void main()

      {

           long int s=0,m,n,i;

           clrscr();

           printf("Enter the number ");

           scanf("%ld",&n);

           m=n;

           printf("\nNumber %ld and in Sorted order ",n);

           for(i=0;i<=9;i++)

              {

                   while(m!=0)

                        {

                            s=m%10;

                            if(i==s)

                                      printf("%ld",s);

                            m=m/10;

                        }

                   m=n;

              }

           getch();

      }

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Frequency of each digits in a given number

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//C – Digit Frequency

#include <stdio.h>

#include <conio.h>

void main()

      {

           long int s=0,m,n,i,c;

           clrscr();

           printf("Enter the number ");

           scanf("%ld",&n);

           m=n;

           printf("\nNumber %ld Digit Frequency :\n\n",n);

           for(i=0;i<=9;i++)

              {

                   c=0;

                   while(m!=0)

                        {

                            s=m%10;

                            if(i==s)

                                      c++;

                            m=m/10;

                        }

                   m=n;

                   if(c>0)

                            printf("%ld Repeated %ld Times \n",i,c);

              }

           getch();

      }

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Prime Numbers between a given Ranges

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//C – Prime Number

#include <stdio.h>

#include <conio.h>

  int isPrime(int N)

      {

           int j;

           for(j=2;j<=N/2;j++)

              {

                   if(N%j==0)

                            return 0;

              }

           return 1;

      }

  void main()   //Start of main

      {

           int Lower, Upper,i,j,flag=0;   //variables

           clrscr();

           printf("\nEnter the Lower Range : ");

           scanf("%d",&Lower);

           printf("\nEnter the Upper Range : ");

           scanf("%d",&Upper);

           for(i=Lower;i<=Upper;i++) //start of outer loop

              {

                   if(isPrime(i)==1)

                            printf("%d  ",i);

              }

           printf("\nPress Any key to Cont...");

           getch();

      }

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