13 replies to this topic

[Jerialou]

I was just annoying the problem that our teacher give it to me...
can someone help me?

this is the problem..how to get the sum of all even and odd numbers from 0 to N...:confused:

im so confusing..what loop am i using...and how to do it...
and what command to separate the odd and even?
because the given that been said to the prob is 0 to n... it means...
the number is unlimited...

our teacher give a clue to me...
the output would be like this
*ex.*
Enter the number:10<ex no.>

the sum of even number:30
the sum of odd number:25
***
:confused::confused: what will i do?
can anyone help me?

[WingedPanther]

1) Do you know how to tell if a number is even or odd?
2) Do you know how to sum all numbers from 0 to N?

[G_Morgan]

n/2(a+l)

where n is the number of items, a is the first item and l is the last item. This probably isn't how they expect you to solve it though.

[dargueta]

Use for loops, one starting at 0 and the other starting at 1. Increment them by two instead of one, and just add the sums.

[Jerialou]

thank you..dargueta,

i did it now...but...the even numbers only appeared..
>.<
but somethings missing..
can you help me?

here's my code..i made up..

*******

#include <stdio.h>
#include <conio.h>

int main()
{
int n,a,b,c;

printf("enter number:");
scanf("%d",&n);

for (a=1;a<=n;a++){

b=a+a+n;
}
printf("The Sum of the even number:%d\n",b);
getch ();
}

*****

do you think this is right?
or maybe im mistaken.. >.<
help me pls... :(

[WingedPanther]

Based on your response: You don't know how to sum a sequence of numbers. Your code to add the numbers 1 to N should look like this:

for (a=1;a<=n;a++) 
{
  b = b+a;
}

Also, a++ increments your counter by 1, not by 2 as dargueta suggested.

[dargueta]

You'll need two separate for loops, by the way.

[broncoslb]

int n;
int oddSum = 0;
int evenSum = 0;
printf("Enter the n value: ");
scanf("%d",&n);

// To sum the odd numbers
for(i=1; i<=n; i+2)
    oddSum+=i;

// Same for even but start i=0

printf("Odd sum was %d\nEven sum was %d",oddSum,evenSum);

[v0id]

@broncoslb: Please use the so-called code-tags, when you're posting some code.

[dargueta]

Your code looks right, though.

[amischiefr]

for(int i = 1; i <= n; ) {

     oddSum += i++;

     evenSum += i++;

}

why write two loops?

[broncoslb]

If n is an odd number then your evenSum would be off by +1.