Error when getting the summation

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C

I'm trying to get two different summations but whenever I run it I get the error 'Floating point exception (core dumped)'. I can't figure out why though. I've tried playing around with setting my n's to different values but that doesnt seem to change anything

What I have tried:

#include<stdio.h>  

int main()                                                                     
{   
   float s=0,t=0;
   int n;
   for(n=1;n<=123456;n++)
   {
        s=s+(2/(n*n));
   }
   n=0;
    for(n=123456;n>=1;n--)
   {
        t=t+(2/(n*n));
   }
   printf("\n%f",(3.14*3.14/3));  
   printf("\n%f",s);
   printf("\n%f",t);
   printf("\n%f",s-t);
   printf("\n%e",s-t);
   printf("\n%g",s-t);
   return(0);                                 
}