Thread: This sounds easy but have never done it

I need to combine these programs into one program that works for a positive integer "n"
The first is a sum of squares starting with 1 until "n"
The second is a sum of cubes starting with 1 until "n"
The third is a sum of fractions starting with 1/2^1 until 1/2^n
I know I need to take out my exit stuff until the last one and all I need is one set of preprocessor directives.

Code:

#include <stdio.h>
#include <math.h>

main ()
{
/* Declare variables */
  int i, n, sumsquare = 0;;
  printf("Enter n: \n");
  scanf("%d", & n);
    /* Set for loop conditions */
  for (i=1; i <= n; i++) 
  {
        sumsquare += i*i; 
  }
      printf ("The sum of the squares from 1..%d is %d\n", n, 
      sumsquare);
 system("pause");
 exit(0); 

}
{
/* Declare and initialize variables */
  int i=0, n, sumcubes=0;

  printf("Enter n: \n");
  scanf("%i", &n);

/* Set for loop conditions */
  while (i++<n) 
  {
  sumcubes += (i*i*i);
  }
  printf ("The sum of the cubes from 1..%d is %d\n", n, 
      sumcubes); 
 system("pause");
 exit(0); 

}
{
    unsigned int i = 1, n;
    float sum=0;

    printf("Enter n: \n");
    scanf("%u", &n);

    do 
    {
        sum += (1/(pow(2,i)));
    } 
    while (i++ < n);

    printf ("The sum of the fractional exponentials from 1 ... %u is %f\n",
            n, sum);   
    system ("pause");
    return 0;
}

This is the best I can do right now & the compiler highlights the bracket of the second program. This is actually more interesting than I thought. Thank you quzah.
I am going to apologize ahead of time for the lengthy code

Code:

 main ()
{
/* Declare variables */
  int i, n, sumsquare = 0;;
  printf("Enter n: \n");
  scanf("%d", & n);
    /* Set for loop conditions */
  for (i=1; i <= n; i++) 
  {
        sumsquare += i*i; 
  }
      printf ("The sum of the squares from 1..%d is %d\n", n, 
      sumsquare);
 system("pause");

}
int main ()
{
/* Declare and initialize variables */
  int i=0, n, sumcubes=0;

  printf("Enter n: \n");
  scanf("%i", &n);

/* Set for loop conditions */
  while (i++<n) 
  {
  sumcubes += (i*i*i);
  }
  printf ("The sum of the cubes from 1..%d is %d\n", n, 
      sumcubes); 
 system("pause");

}
int main ()
{
    unsigned int i = 1, n;
    float sum=0;

    printf("Enter n: \n");
    scanf("%u", &n);

    do 
    {
        sum += (1/(pow(2,i)));
    } 
    while (i++ < n);

    printf ("The sum of the fractional exponentials from 1 ... %u is %f\n",
            n, sum);   
    system ("pause");
    return 0;
}

The main function is only supposed to be defined once, and you've written it three times. My suggestion is to rewrite your program anew from Quzah's outline.

And this has been bugging me; it's int main(void) .

I straightened it out and I appreciate you all's comments.
I want to say more but it's just stupid sentiment.
Thanks I have learned a lot.

Why did you send this to me as a private message? You have already had the issue solved by quaza.

If you have a problem you send as a private message, please make sure it is unsolved in the future, then people will be able to help you better

I am new to the forum and I was hoping for a new insight.
I did not mean to bother you.
I will not abuse the ettiquete of the forum, but please understand I am learning.