adding elements of an array

I need to write a code that will add 15 random elements in an array.
This is what i have but i cannot get it to add any elements, it always returns 0

Code:

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int main() {
    int a[15];
    int sum = 0;
    int i;

    for (int i = 0; i < a[15]; i++)
        sum += a[15];
    printf("%d", sum);
    return 0;
}

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With "return 0" what do you expect?

I should have thought of that first, Im just learning the language and it gets confusing sometimes. i tried removing the return 0 part and still get nothing. do you have any suggestions?

Quote:

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Originally Posted by tabstop

With "return 0" what do you expect?

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lol dude... i think you need to sleep for a while...;) you missed it!(or did you?oO)

it should be sum+=a[i]; not a[15]
and it should be 15 not a[15]...in the for statement,and you have declared i already, no need to declare again in for statement
and where are you accepting the values for a[15]?

return 0 is fine

next time add braces({ }) even if its for single statements.

Code:

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for(i=0;i<15;i++)
{
    sum=sum+a[i];
}

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not

Code:

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for(i=0;i<15;i++)
  sum=sum+a[i];

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the second is difficult to read...sometimes

chelito19, next time please indent your code and post it within [code][/code] bbcode tags. I have done it for you this time.

i tried that at first and got nothing so i changed it, but i dont know if im missing something in the printf command, like a variable or something

Quote:

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Originally Posted by chelito19

i tried that at first and got nothing so i changed it, but i dont know if im missing something in the printf command, like a variable or something

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You want to loop over the elements of the array, so you should loop from index 0 to index 14. The typical way of doing this is to keep looping while your index is less than the number of elements in the array. What you are doing now is looping while your index is less than a[15], which does not exist.

Quote:

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Originally Posted by creeping death

lol dude... i think you need to sleep for a while...;) you missed it!(or did you?oO)

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Yes you're right; I read the description (always returns 0) and saw the return and leapt. Sorry.

Quote:

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Originally Posted by laserlight

chelito19, next time please indent your code and post it within [code][/code] bbcode tags. I have done it for you this time.

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before i post what i fixed in my code, how do i do this part about indenting my code?

type [*code] (without the * ofcourse) then paste your code then type [/code] thats all

and btw...you are not really taking random nos...you are taking garbage values...

ok so you are saying that i should define those 15 elements, the program is supposed to run with up to any 15 values (not necessarily 15, could be less)

Code:

---

  for (i = 0; i < 15; i++){
      while (i < 15)
      sum=sum+a[i];
  }
  printf("%d", sum);
  return 0;

---

Quote:

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Originally Posted by chelito19

ok so you are saying that i should define those 15 elements, the program is supposed to run with up to any 15 values (not necessarily 15, could be less)

Code:

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  for (i = 0; i < 15; i++){
      while (i < 15)
      sum=sum+a[i];
  }
  printf("%d", sum);
  return 0;

---

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why while inside for???
what output do you get?how will you get out of while loop?

i m saying you should use rand() to initialise each element of the array to a random value.

but first go thought this
http://www.cprogramming.com/tutorial/c/lesson3.html

with while i didnt get anything, it seemed to never terminate. so i went back to what i had when at least it was returning 0. I dont think we are supposed to select 15 random numbers, the instructor will do it, or he could choose only 2 or 6 numbers, up to 15.

In that case, initialise your array to have all elements set to 0, then read in input to fill the array.

Quote:

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Originally Posted by chelito19

with while i didnt get anything, it seemed to never terminate. so i went back to what i had when at least it was returning 0. I dont think we are supposed to select 15 random numbers, the instructor will do it, or he could choose only 2 or 6 numbers, up to 15.

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it never terminates because it never comes out of while loop....ever
read the link my friend...you dont have much idea about how a loop works...the link describes how loop works....
Cprogramming.com Tutorial: Loops

forget about what i said about rand() for time being...you will learn about it eventually...