range-checking

I have a program that assigns an array beyond it's bounds, and I was expecting a run-time error to be thrown. Yet no error is raised at all and the program proceeds to write into undeclared memory. Is there some compiler option to guard against this? With the memory dump shown it is clear this overreach of bounds is real. Is there a way to declare variables or argument specs to catch this? Obviously this is a clear case, but when tasked to maintain thousands of lines of F77 derived code it is not always clear (to me) if this might be happening. PROGRAM TEST_CODE IMPLICIT NONE INTEGER*4 :: R(5)

So I just came across what seems to me like a strange Python feature and wanted some clarification about it. The following array manipulation somewhat makes sense: p = [1,2,3] p[3:] = [4] p = [1,2,3,4] I imagine it is actually just appending this value to the end, correct? Why can I do this, however? p[20:22] = [5,6] p = [1,2,3,4,5,6] And even more so this: p[20:100] = [7,8] p = [1,2,3,4,5,6,7,8] This just seems like wrong logic. It seems like this should throw an error! Any explanation? -Is it just a weird thing Python does? -Is there a purpose to it? -Or am I thinking about this the wrong

I want to check whether the given coordinates are withing an array or not. public boolean checkBounds(int x, int y) { try { Object val = array[x][y]; return true; } catch (ArrayIndexOutOfBoundsException e) { return false; } } Can I do it like that? Is it an efficient way to do it? What happens when we use exceptions to perform boundary checks? Using exceptions for handling operations like null checking, bounds checking, file existance checking introduces a lot of overhead whenever the exception is thrown. What you would have done if you simply checked the bounds: check the size of an array

I'm trying to check a current date and time is in between Friday 17:42 and Sunday 17:42 of the week with Java. At the moment I'm doing this with really really bad code block. It was a hurry solution. Now I'm refactoring but I couldn't find any method in joda or etc. Any ideas? Thanks private final Calendar currentDate = Calendar.getInstance(); private final int day = currentDate.get(Calendar.DAY_OF_WEEK); private final int hour = currentDate.get(Calendar.HOUR_OF_DAY); private final int minute = currentDate.get(Calendar.MINUTE); if (day != 1 && day != 6 && day != 7) { if (combined != 0) {

I'm building an application for receiving grades and I want to make sure that the Edit Texts are not empty and the values are less or equal to 100 I wrote this line but it crashes the application if(Integer.parseInt(editText.gettext().toString()) > 100 || editText.getText().toString().trim().length() == 0) { //Error message for example } and this is the logCat 09-04 18:21:06.331 8649-8649/com.example.nima.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.nima.myapplication, PID: 8649 java.lang.IllegalStateException: Could not execute method of the activity at android

How can one switch off range checking for a part of a file. Switching off is easy, but how do I revert to the project setting later on? The pseudo-code below should explain it: Unit1; //here's range checking on or off as per the project setting code here... {$R-} //range checking is off here because the code causes range check errors code here... //now I want to revert to the project setting. How do I do that? code here... end. Sertac Akyuz See: IFOPT directive . {$IFOPT R+} {$DEFINE RANGEON} {$R-} {$ELSE} {$UNDEF RANGEON} {$ENDIF} //range checking is off here because the code causes range