Sum of series

#include<stdio.h>

void main()

{

     int i,j,k=0;

     char sym='+';

     printf("Enter n>> ");

     scanf("%d",&i);

     for(j=1;j<i;j+=2)

     {

          sym=sym=='+'?'-':'+';

          k+=j;

          printf("%d %c ",j,sym);

     }

}

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