Help Starting out a GetSeries program.

[xsojournerx]

I'm having a bit of trouble writing the code for a program. The program has two functions.

Main: Gets the target sum and then calls GetSeries.

Getseries: Determines the first and last integers in EVERY series of positive, consecutive INTEGERS whose sum is the target sum. Output sent to the screen . object.

Now I can get the target sum, but I am having trouble calling getseries and then determining the integers for the sum.

This is my program so far. Any help would be much appreciated. Also I have K.N. King's C programming book.

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int tsum, firstnum, secondnum;

    printf("Enter the target sum: ");
    scanf("&#37;d", &tsum);

    
    return 0
}

[Adak]

I'm having a bit of trouble writing the code for a program. The program has two functions.

Main: Gets the target sum and then calls GetSeries.

Getseries: Determines the first and last integers in EVERY series of positive, consecutive INTEGERS whose sum is the target sum. Output sent to the screen . object.

Now I can get the target sum, but I am having trouble calling getseries and then determining the integers for the sum.

This is my program so far. Any help would be much appreciated. Also I have K.N. King's C programming book.

#include <stdio.h>
#include <stdlib.h>

//definition of getSeries function
int getSeries(int);

int main()
{
    int tsum, firstnum, secondnum;

    printf("Enter the target sum: ");
    scanf("&#37;d", &tsum);

   getSeries(tsum);  //call the function    
    return 0
}
//return from this series will tell if any series was found
int getSeires(int target)   {  //stack has copied tsum and named it target, here
   int i, j, k;
 
   /* now we need to know where the data is, that needs to be checked */

   return 0;
}

Hope that helps.

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Just highlight the code, then click on the hash sign, at the top of the post frame '#'.

[xsojournerx]

#include <stdio.h>
#include <stdlib.h>

//definition of getSeries function
int getSeries(int);

int main()
{
    int tsum, firstnum, secondnum;

    printf("Enter the target sum: ");
    scanf("%d", &tsum);

   getSeries(tsum);  //call the function    
    return 0
}
//return from this series will tell if any series was found
int getSeires(int target)   {  //stack has copied tsum and named it target, here
   int i, j, k;
 
   /* now we need to know where the data is, that needs to be checked */

   return 0;
}

Hope that helps.

When you post code, be sure to wrap it in code tags so it displays right on the forum.
Just highlight the code, then click on the hash sign, at the top of the post frame '#'.

So now that I have the getSeries, which loop would be best to find the consecutive integers?

I was thinking something like a while or a for loop, but this part just draws a blank for me. It seems as though I wouldn't even use a loop. Maybe it's just I don't know how to word it to find the two integers.

[scwizzo]

I think a for loop would work. Find out how long the integers are, or how many of the integers you have and loop it that many times with a for loop.

//something like this for example
for(int i = 0; i <= size/number of integers; i++)

//also make sure you spell things the same

int main()
{
    int tsum, firstnum, secondnum;

    printf("Enter the target sum: ");
    scanf("&#37;d", &tsum);

   getSeries(tsum);  //call the function    
    return 0
}
//return from this series will tell if any series was found
int getSeires(int target)   {  //stack has copied tsum and named it target, here
   int i, j, k;
 
   /* now we need to know where the data is, that needs to be checked */

   return 0;
}

[xsojournerx]

Problem is that the length of the integer is based on the input of the user. Say the user entered 30. The program would have to printed as many series as possible thats sum is 30. And frankly I've never used getSeries before so I'm clueless.

[tabstop]

And frankly I've never used getSeries before so I'm clueless.

What, and we have?

Anyway, you need to decide how to tell whether the series starting with (say) 1 can reach your target. And then whether the series starting with (say) 2 can reach your target. And then whether the series starting with (say) 3 can reach your target. And then....

[Adak]

The getSeries function is just a name I thought up - we have to write up our own code for it, see?

It's like a backyard garden - you grow your own.

So we're just doing this for ONE sum? Just *ONE* sum?? EZ smeazy.

I like a while loop for this, but a for loop can work just as well. Your choice. The logic will be very similar.

[Adak]

Just some idea's:

#define MAX 100

int answer[MAX] = { 0 };

int main(void)  {

   get your sum number, here
   getSeries(sum);

   printf("\n\n\t\t Program Complete - Press Enter to Continue");
   gar = getchar(); gar++;  //holds the console window open
   return 0;
}

int lo, hi, i, j, tally, count;  //sum came into the function on the parameter set

say sum is 10
hi = sum / 2 + 2;
//10/2 = 4, so add one, but one can be part of a series, so add one more
lo = 1;

while(lo < hi)   {
   set tally to zero, here

   /* idea here is to start at the low end, and add up the numbers, into tally,
      until tally is > target.  
   */
   
   for(i = lo, j = 0; tally < sum; i++)  {
      tally += i;
      answer[j++] = i;

      if( tally == sum)  {
         print the whole set of numbers in answer[], that have made up tally
         count++;  //count the sets that meet the criteria.
      }


   }
   lo++;
   reset the answer[] here, to all zero's.
}

This won't solve your problem. Just a step in the right direction.

Edit: This thought worked out well. Interestingly, the only numbers w/o at least one series of consecutive integers
equaling their sum, have an odd coincidence with computers:
1, 2, 4, 8, 16, 32, 64, 128, 256, 512 where Sum = 1 - 1,000.