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Write a program that calculates sum of the integers numbers

Asked by Aaron Moris

Aaron Moris

on 11 Apr 2011

What is the product if the question is write a program that calculates and prints the sum of the even integers from 2 to 30?

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Aaron Moris

Aaron Moris

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5 Answers

Answer by Florin Neacsu

Florin Neacsu

on 11 Apr 2011

2+4+6+...+30=2(1+2+3+...+15)=2*(15*16)/2=15*16

So 2+4+...+n = floor(n/2)*(floor(n/2)+1).

Regards, Florin

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Florin Neacsu

Florin Neacsu

Answer by Matt Fig

Matt Fig

on 11 Apr 2011

The product would be the sum of the even integers from 2 to 30 ;-).

Seriously, what have you tried so far on this homework problem?

2 Comments

Sean de Wolski

Sean de Wolski

on 11 Apr 2011

You might need some bubble wrap for that.

Paulo Silva

Paulo Silva

on 11 Apr 2011

I hate when it takes more time to understand what people want than to make their answer!

Matt Fig

Matt Fig

Answer by Paulo Silva

Paulo Silva

on 11 Apr 2011
v=2:30;
sum(v(~mod(v,2)))  

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Paulo Silva

Paulo Silva

Answer by Doug Eastman

Doug Eastman

on 11 Apr 2011

or

sum(2:2:30)

2 Comments

Paulo Silva

Paulo Silva

on 11 Apr 2011

that's simple but if you change the start value from 2 to 1 you do the sum of odd numbers instead, also if the last value is 31 or some odd number the result won't be correct, unfortunately that's not very flexible code.

Paulo Silva

Paulo Silva

on 11 Apr 2011

btw that does work and is a good answer for the question (only if the values don't change), +1 vote

Doug Eastman

Doug Eastman

Answer by Matt Tearle

Matt Tearle

on 11 Apr 2011
disp(240)

Or, for pedants who claim that evaluation is not the same as calculation,

disp(239+1)

1 Comment

Sean de Wolski

Sean de Wolski

on 11 Apr 2011

This is definitely the most compact and efficient way to do this. +1.

Matt Tearle

Matt Tearle

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