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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n;
  5.     printf("Enter the number: ");
  6.     scanf("%d",&n);
  7.     int sum=0;
  8.     for(int i=1;i<=n;i++){
  9.      if(i%2!=0) sum=-n/2;
  10.      else sum=(-n/2)+n;
  11.     }
  12.     printf("Sum of series is %d",sum);
  13.  
  14. 	return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5320KB
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Enter the number: Sum of series is 3
https://ideone.com/S5O9Uf
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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