I run your code on my local env and then knew why NaN exception thrown out. The variable total is retrieved from html input element value according to your code above, but total variable will be string empty before executed line parseInt(cash)+parseInt(checks)+parseInt(coin);. After that, parseInt will return NaN after parse empty string to int. So … Read more
The way that the ++ “postfix” increment operator works involves first performing a conversion to number type. The value of that conversion is always the return value from the operation, even if that value is NaN. solved Why NaN is returned by a post-increment operator? [closed]
As stated already in the comments, your program has many code style problems (wrong intentation, …) as well as not using best Fortran practises (e.g. implicit none). Your problem can be solved by trivial usage of a debugger. An obvious problem is that you are using uninitialized variables in the functions: subroutine f(x,y,fx,fy) : rho, … Read more