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  1. #include<stdio.h>
  2. #include<math.h>
  3. int main()
  4. {
  5.     int i,sum=0,n;
  6.     scanf("%d",&n);
  7.     if(abs(n)<=10000)
  8.     {
  9.         if(n<=0)
  10.         {
  11.             for(i=1;i>=n;i--)
  12.                 sum+=i;
  13.         }
  14.  
  15.         else
  16.         {
  17.             sum=((n*n)+n)/2;
  18.         }
  19.  
  20.     printf("%d",sum);
  21.  
  22.     }
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout 0s 10320KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/Q6C1gh
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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