fork download
copy 
  1. // question 1 (You have given a series, 1+2+3-4-5-6+7+8+9-10-11-12+......N . Your task to print the sum of the Nth element.)
  2.  
  3. #include <stdio.h>
  4.  
  5. void num(int a);
  6.  
  7. int main()
  8. {
  9.    int y;
  10.    scanf("%d", &y);
  11.  
  12.    num(y);
  13.    return 0;
  14. }
  15.  
  16. void num(int a)
  17. {
  18.  
  19.    int i, sum1 = 0, calc = 0;
  20.  
  21.    for (i = 1; i <= a; i++)
  22.    {
  23.  
  24.       if (calc % 2 == 0)
  25.          sum1 += i;
  26.       else
  27.          sum1 -= i;
  28.  
  29.       if (i % 3 == 0)
  30.          calc++;
  31.    }
  32.  
  33.    printf("%d ", sum1);
  34. }
Success #stdin #stdout 0.01s 5436KB
comments (?)
stdin
copy 
20
stdout
copy 
12
https://ideone.com/xPonIG
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!