My C Program....

After blogging and collecting informations for my story,I felt very bored.It has been quite a while since I programmed.So I did a c program(my favorite language) to group numbers based on the sum of digits(finally truncated to a single digit).I learnt hashing last year.But never really tried it out.In my sem I had a similar program where I had to group numbers based on the number of digits that repeat in that number.So I did this program as a time pass.

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/*

Name: GROUPING PROGRAM

Copyright: SD

Author: Deepak Senthilkumar

Date: 06/12/07 14:56

Description: It is a program to group numbers based on the sum of digits!!!

*/

#include stdio.h

/*

These header files are not required in dev c++...But they are requred in Turbo c/c++

#include stdlib.h

#include conio.h

#include alloc.h

*/

struct table

{

int num;

struct table *next;

};

struct table a[9];

int digitsum(int num)

{

int sum,temp,n;

temp=0;

n=num;

sum=0;

while(n>0)

{

temp=n%10;

sum=sum+temp;

n=n/10;

}

return sum;

}

int tdigitsum(int num)

{

int tsum;

tsum=digitsum(num);

if(tsum>9)

tsum=digitsum(tsum);

tsum=digitsum(tsum);

return tsum;

}

void input()
{

int inum,isum;

struct table *newn,*curr;

printf("\n\nEnter a number:");

scanf("%d",&inum);

isum=tdigitsum(inum);

curr=&a[isum];

while(curr->next!=NULL)

curr=curr->next;

newn=(struct table *)malloc(sizeof(struct table));

newn->num=inum; newn->next=NULL;

curr->next=newn;

}

void display()

{

int i;

struct table *curr;

for(i=1;i<10;i++)//>

{

curr=&a[i];

curr=curr->next;

while(curr!=NULL)

{

printf("%d ",curr->num);

curr=curr->next;

}

}

}

int main()

{

int choice,check;

check=0;

printf("\nWELCOME TO MY PROGRAM OF GROUPING THE NUMBERS BASED ON SUM OF DIGITS!!!!\n");

do

{

printf("\n\nMENU\n\n 1. INSERT \n 2. DISPLAY\n 3. EXIT\n");

printf("\nENTER CHOICE : ");

scanf("%d",&choice);

switch(choice)

{

case 1:

input();

check=1;

break;

case 2:

if(check)

display();

else printf("\n\nNothing there to be displayed\n");

break;

case 3:

exit(0);

}

}while(1);

return 0;

}

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What do you think about the program?

Post your suggestions!