I keep getting this weird output from my code everytime I use the 'start without degugging' (ctrl-F5) as opposed to normal 'debug' (F5).

When I try to find the following value of norm_differnece in debug (pressing F5) mode, it gives me the correct answer for norm_difference

normdifference = 1.000000

but in 'start without debugging' (pressing ctrl-f5) the wrong output

normdifference = 1456816083547664100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000

The following is a segment of code which is gives the output Note: X[] = is a array of stored DOUBLE values

for(i=0;i<n;i++){
    sum_difference += (pow((X[i*n]-X[i]),2));
      }
    norm_difference = sqrt(norm_difference);
for(i=0;i<n;i++){
    sum_norm_1 += pow(X[i],2);
      }
    norm_1 = sqrt(norm_1);
  //Take square root of the sum of squares for the row
    printf("normdifference = %f \n norm_1 = %f \n",norm_difference,norm_1);