Thread: Do While loop

What does the compiler actually say?

Have you included the math.h header file?


[EDIT]

His surname is actually spelt 'Wiggum', by the way. :P


[EDITv2]

Also, you need to add a comma to this line:

Code:

printf ("The sum of the fractional exponentials from 1. . .%d is %d\n",n,sum);

Damn Wiggum. . .I am particularly fond of him.
thanks for the corrections
The compiler reads 2 lines I put in in the code box. i guess I don't need code but it looks better

Code:

 
               In function `main': 
line 11     syntax error before ';' token

Code:

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

int main (void)
{
    int i=0, n, sum=0;
  printf("Enter n: \n");
  scanf("%i", &n);
    do 
    {
    sum += (1/(pow(2,i));
    printf ("The sum of the fractional exponentials from 1. . .%d is %d\n",n,
           sum);   
    } 
    while (i++<n);

    return 0;
}

"line 2:18 [Warning] extra tokens at end of #include directive "

Sounds to me like one of your include lines has a semi-colon, or some other character at the end of it - which it doesn't need.

Always read the compiler errors and warnings from the top first - they usually trigger the errors that follow them.

[EDIT]

Bahahahahahaha, I'm an idiot, I should have noticed earlier. You need one more bracket in that line.

Code:

sum += (1/(pow(2,i)));

Ahh, that would be the fact that it returns without waiting.

Have a read of this: Stop my Windows Console from disappearing everytime I run my program?


Actually, this would probably help more - http://faq.cprogramming.com/cgi-bin/...&id=1043284385

Originally Posted by bivhitscar

His surname is actually spelt 'Wiggum', by the way. :P

Well you can't seriously expect Ralph to be able to spell his own name! I mean, come on, it's Ralph we're talking about here!

Quzah.

Ok quzah, you do have a point there. :P

Of course, integer division. Try changing 'sum' to a float and altering this line:

Code:

sum += (float) (1/(pow(2,i));

SKEane
You are right. . .thanks. Man I am sloppy!
bivhitscar
Sorry am changing my code right now per your suggestion

EVen with that (float) it still displays that number

Damn I need to change %d. . .thanks you all!

Okay changed the %d and I'm getting closer.

When I select a number for "n" like 3 it displays 4 lines "The sum. . .is 1.0000"
"The sum. . .1.5000"
"The sum. . .1.75000"
"The sum. . .1.87500"
so I'm headed in the right direction with this thing.

Code:

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

int main ()
{
    float i=0, n, sum=0;
  printf("Enter n: \n");
  scanf("%f", &n);
    do 
    {
    sum += (float) (1/(pow(2,i)));
    printf ("The sum of the fractional exponentials from 1. . .%f is %f\n",n,
           sum);   
    } 
    while (i++<n);
    system ("pause");
    return 0;
}

Change your printf function to display %f for sum.