I cant' figure whats wrong w/my C++ program!HELP!?

So im supposd to write a program that calculates


the sum of 1/n! (1 divided by n factorial) , n=1 to 100


or n=1 below the Sigma sign, 100 above, 1/n1 on the right of the sigma sign


This is my program:


keep in mund C++





#include %26lt;iostream%26gt;


using namespace std;


int main ()


{


int i,fact=1,sum;





for(i=1;i%26lt;=100;i++)


{ fact = fact * i;





sum = 1/fact;





cout%26lt;%26lt;sum;


}





return 0;


}





after i compile link it and execute it i get a message saying


Arithmetic Exception (core dumped)


What is that?


Help please who ever is out there.

I cant' figure whats wrong w/my C++ program!HELP!?
This program has a lot of issues


1stly, you should 1st initialize sum to 0 and then use


sum+= 1/fact (because you want the summation and not each of them individually)





the second problem is, that you should be declaring sum as a double and not an int.


int x=1/2 //implies x=0


double x=1.0/2 //implies x=0.5





this brings me to the 3rd problem.


1/fact will always be zero since 1%26lt;fact and both are ints. you need to write that as 1.0/fact





and to wind it up, one last problem, fact(100) is a really large number. it cant be stored as an integer. I am too lazy to try, but I am pretty sure you cant store it as a long either. you will get overflows of numbers (number turning into a negative number), which will skew your results.





I am appending a similar program. see if it makes sense to you


#include %26lt;iostream%26gt;


using namespace std;


int main ()


{


int i,fact=1;


double sum=0; //sum is now double and initialized to 0





for(i=1;i%26lt;=10;i++) //10 and not 100


{


fact *= i;


sum += 1.0/fact; //adding to sum. also 1.0 and not 1


cout%26lt;%26lt;sum%26lt;%26lt;endl; //appending a newline. this helps bufferring the stream and you catch errors better


}


return 0;


}





All the best
Reply:Make sure fact is not 0 at all... I know


you intialied fact before the i loop to one...


but does it stay above 0 all the time in the loop...





usually a arithmetic expcetion means


you try to divide a 0 or...


the division symbol is not the right one..


since it's integer...


remember you are not getting integer result 1/2 is .50





here is what you can do to see what is the probem


take out the sum=1/fact for now and put a


cout %26lt;%26lt; fact %26lt;%26lt; endl; to see if fact is putting out the right numbers... if not than you know..


if it seems right...


put back the sum=1/fact;


but check to see if you are allowed to use / because you are getting a decimal value and you may have to use..


the var real...
Reply:try unsigned long i,fact=1,sum;


instead of int i,fact=1,sum;