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# How do you write a program that calculates the sum of odd numbers from 1-99?

I need to write a program using the for statement that calculates the sum of all odd numbers 1-99..

and if you do, can you please explain why you use the % symbol because i know you need to use that..

THANK YOU :D

### 3 Answers

- 1 decade agoFavorite Answer
Using the mod symbol (%), you can find out if the number has a remainder. So if there's a remainder when dividing by 2, it's an odd number. So using the % operator, you can perform the following:

int i;

int sum=0;

for(i=1; i<=99; i++) {

if(i%2==1) // there's a remainder

sum += i;

}

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- EileenLv 44 years ago
Formula should be: SUM= (N * (N+1))/2 (In this case, there are 100 numbers, so N=100) Answer is 5050 All you have to do then is set your variables, and create a message box.

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- C BLv 41 decade ago
int answer = 0;

for(int i = 1; i <= 99; i = i + 2){

answer += i;

}

that'll give you the answer, no mod (%) required. Feel free to message me with questions.

Source(s): CS major- Login to reply the answers