sum = 0;
isConvergent = 0;
for(k=1;k<=1e10;k++) {
   sum += 1.0/(k*k);
   /*Test partial sums*/
   if(k%50==0) {
     /*Check change in sum*/
     if(sum - oldSum < 1e-8) {`\includegraphics{arrow.pdf}`
       isConvergent = 1;      `\includegraphics{arrow.pdf}`
       break;                 `\includegraphics{arrow.pdf}`
     }                        `\includegraphics{arrow.pdf}`
   }
}

if(isConvergent==1) {
   printf("The sum = %lf.\n",sum);
}
else {
   printf("No convergence within 1e10 steps.\n");
}