function

[sifeet]

Hi,
There is this exercise which I have to make an own function in it.
It goes like this:
sum(n) = 1+2+3+...+n
Here is the code I wrote. I get a syntax error in line 14. also an error in line 13 which says that variabel "dsum" is unused!!
Where in program should I make changes? Appreciate it a alot if someone can give me a clue!

#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
int sum(int i);
int main()
{
  printf("%d\n",sum(5));
  return 0;
}
int sum(int i)
{
  int r = 1;
  int dsum = 0;
  for(r<=i){
    dsum += r;
    r++;
  }
  return sum;
}

[matsp]

The syntax for your "for" loop is incorrect. The correct syntax is

for(initialization ; exit-condition ; update)

You can omit any of the three components, but you DO need the semicolons - and an empty exit-condition means "always true".

Once the compiler got confused by the lacking semi-colons, it may not realize what the rest of that loop does, and "undefined behaviour" applies.

--
Mats

[sifeet]

The syntax for your "for" loop is incorrect. The correct syntax is

for(initialization ; exit-condition ; update)

You can omit any of the three components, but you DO need the semicolons - and an empty exit-condition means "always true".

Once the compiler got confused by the lacking semi-colons, it may not realize what the rest of that loop does, and "undefined behaviour" applies.

--
Mats

Thanks alot for d answer =)