D019: computing 1 + 2 + 3 + 4 ...... + N sum

D019: Calculate the sum of 1 + 2 + 3 + 4... + n

Content:

Calculate the sum of 1 + 2 + 3 + 4... + n

Input description:

An integer n

Output description:

And

Input example:

If the questions are not described in detail, read them in multiple groups of test data, or refer to a001.

 
100
 

 

Output example:

 
5050
 

Tip:

 

Source:

(Administrator: Problem)

Answer: <Textarea Cols = "50" rows = "15" name = "code" class = "CPP"> # include <iostream> <br/> # include <iomanip> <br/> using namespace STD; <br/> int main () <br/> {<br/> int N, I, H = 0; <br/> CIN> N; <br/> for (I = 0; I <= N; I ++) <br/>{< br/> H = I + h; <br/>}< br/> cout <H <Endl; <br/> return 0; <br/>}</textarea>