negative-number

As an assignment in school, we have to write a C++ program and returns different error codes in the main . The problem is that we have to return -2 if a specific error occurs but I have no idea how to return a negative value. For example: int main() { int a = -2; return a; } In windows this gives me a return value like: 42232684 and in Linux there is: 253 Why -2 is not allowed? And how can I manage to get -2 ? The problem is that what is returned to the OS is then interpreted by the OS shell as IT likes it, not as your program likes. the main function returns an int, and return -2 is just what

in Javascript I can't seem to find a method to set negatives to zero? -90 becomes 0 -45 becomes 0 0 becomes 0 90 becomes 90 Is there anything like that? I have just rounded numbers. Just do something like value = value < 0 ? 0 : value; or if (value < 0) value = 0; or value = Math.max(0, value); I suppose you could use Math.max() . var num = 90; num = Math.max(0,num); // 90 var num = -90; num = Math.max(0,num); // 0 If you want to be clever: num = (num + Math.abs(num)) / 2; However, Math.max or a conditional operator would be much more understandable. Also, this has precision issues for large

I have a Java method in which I'm summing a set of numbers. However, I want any negatives numbers to be treated as positives. So (1)+(2)+(1)+(-1) should equal 5. I'm sure there is very easy way of doing this - I just don't know how. Just call Math.abs . For example: int x = Math.abs(-5); Which will set x to 5 . The concept you are describing is called "absolute value", and Java has a function called Math.abs to do it for you. Or you could avoid the function call and do it yourself: number = (number < 0 ? -number : number); or if (number < 0) number = -number; You're looking for absolute value,

I want to check if a number is negative. I'm searching for the easiest way , so a predefined javascript function would be the best but I didn't found yet anything, here is what I have so far but I don't think that this is a good way: function negative(number) { if (number.match(/^-\d+$/)) { return true; } else { return false; } } polygenelubricants Instead of writing a function to do this check, you should just be able to use this expression: (number < 0) Javascript will evaluate this expression by first trying to convert the left hand side to a number value before checking if it's less than

I'm currently working on solving a system of ordinary differential equations using deSolve , and was wondering if there's any way of preventing differential variable values from going below zero. I've seen a few other posts about setting negative values to zero in a vector, data frame, etc., but since this is a biological model (and it doesn't make sense for a T cell count to go negative), I need to stop it from happening to begin with so these values don't skew the results, not just replace the negatives in the final output. My standard approach is to transform the state variables to an

I am converting the incoming string into hash code by doing the following function but some of the values are negative. I don't think hash values should be negative. Please tell me what I am doing wrong. int combine = (srcadd + dstadd + sourceport + destinationport + protocol).hashCode(); System.out.println(combine); I don't think hash values should be negative. Why not? It's entirely valid to have negative hash codes. Most ways of coming up with a hash code naturally end up with negative values, and anything dealing with them should take account of this. However, I'd consider a different