integer Count doesn't increment properly, doesn't work with GCC, but does with CC
Hi there.
I am trying to write a program that approximates the integral of Cos^2, by working out the area under the graph.
It was working on my home computer, running OSX, using GCC to compile, although I gather that GCC and CC are the same thing on OSX.
But, trying to run it on my university computers (Unix) I get some crazy things happening, which seem to be caused by an issue with incrementing an integer.
The code is here.
When I compile with GCC, I get this as my output:
Code:
Count = 3555
Count = 3556
Count = 3557
Count = 3558
Count = 3559
Count = 3560
Count = 3561
Count = 3562
Count = 3563
Count = 3564
Count = 3565
Count = 3566
Count = 3567
The integral of (Cos(x))^2 between 0.000000 and 0.560000 is -22451877030849596034839243233979729137634606950168132554244772637725918156767371541383682094482259477193717530871408213064495352486659616158821156590299808112573904456113502043764019515866649496876255051482750237449798387798526542402632640838500465932172585681913451504091616968612989814208112571000503140352.000000
But using CC, I get this:
Code:
Count = 3560
Count = 3561
Count = 3562
Count = 3563
Count = 3564
Count = 3565
Count = 3566
Count = 3567
The integral of (Cos(x))^2 between 0.000000 and 0.560000 is 0.505039
Which is close enough to the right answer. But, changing
Code:
printf("Count = %d \n",count);
to
Code:
printf("Count = %d \n",count);
I get:
Code:
Count = 7.5543e-311
Count = 7.55642e-311
Count = 7.55855e-311
Count = 7.56067e-311
Count = 7.56279e-311
Count = 7.56491e-311
Count = 7.56703e-311
Count = 7.56916e-311
Count = 7.57128e-311
The integral of (Cos(x))^2 between 0.000000 and 0.560000 is -22451705589472446232067891485971879537344917125398259668867581637663778900599191551604083182741648965856417115723741404561003322543413905388574180837058612935377041503029104856068252778672968498937985004215835788706198650487466264022351694189797328699165952542769808519416934401735683372217923175709814030336.000000
Unfortunately for me, the code is compiled with GCC when marked :(
What on earth is going on?
Thanks for the help :)
