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Questions tagged [underflow]

An arithmetic underflow is a condition in a computer program where the result of a calculation is a number of smaller absolute value than the computer can actually represent in memory.

In computing, buffer underrun or buffer underflow is a state occurring when a buffer used to communicate between two devices or processes is fed with data at a lower speed than the data is being read from it. This requires the program or device reading from the buffer to pause its processing while the buffer refills.

From Wikipedia

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C++ Handle overflow/underflow when extracting string to scalars

when extracting data from string to scalars (char, short, int...), how could I easily know if the value I want to get exceeds the type limit? unsigned char function(void) { std::string str = "259"; std::ostringstream…
kirly
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Stack by pointers in C working except at stack underflow

I implemented stack by using pointers. It is compiling and working but it doesn't underflow when the stack is empty. It gives me some garbage value. I think the problem is something in the create_stack function. I am not getting segfaults no matter…
Aseem Bansal
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Overflow or underflow in the arithmetic operation when clearing large Table

I'm building large (>25,000 rows) Tables. I receive the dreaded Overflow or underflow error somewhere above 25,000 rows. I've tried to reset with psuedo Table = Nothing Table = New Table Table.Rows.Clear() Now, the reset line is referenced in the…
user1382306
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FloatingPointError only shows up in a specific program

I have the same piece of code written in two programs. However I only get the error while running it one program. Here is the file that is works with: #!/usr/bin/env python #FileName: test.py import numpy as np import math mu = 0 sigma =…
still learning
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Overflow and Underflow BigIntegers in C#

I have the following piece of code which i'm trying to comprehend. The Big Integer class (custom, not the standard class) has the following members: private const int maxLength = 2000; private uint[] data = null; // stores bytes…
user720694
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What's the most efficient way to perform bounded addition?

Given an unsigned integer x and a signed integer dx, what's the most efficient way to perform x = x + dx while preventing over/underflow? I could do something like: unsigned int x; int dx; ... long int result = (long int)(x + dx); if (result < 0)…
Jeff L
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Why is a negative size_t underflowing but subtracting it does not?

I have this simple program here which is returning 18446744073709551615: #include using namespace std; int main() { cout<<-(size_t)1; cout<<0-(size_t)1; return 0; } Additionally, I also have this program here which is…
StarckOverflar
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Unexpected underflow

//Data var M = 83 * (10 ^ (-5)); var R = 2077; var Th = 1087; var Tk = 372; var Tr = 667; var a = 90; var Vclc = 9.135 * (10 ^ (-6)); var Vcle = 7.733 * (10 ^ (-6)); var Vswe = 6.105 * (10 ^ (-5)); var Vswc = 6.294 * (10 ^ (-5)); var Vk…
GiaFil7
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Throwing an exception if, for example, int a = Integer.MIN_VALUE-1;

Do you know of any languages which would throw an Exception on Overflow or Underflow? Thanks
Alexandre Santos
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Subtracting two integers causes integer-underflow in device code

In my cuda device code I am doing a check where I subtracting the thread's id and the blockDim to see weather or not the data I might want to use is in range. But when this number goes bellow 0 it seems to wrap back around to be max…
Liiht
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Increment/Decrement byte (char) in c++ with over/under-flow

What is the best way to increment/decrement a byte in c++ while taking into consideration the overflow and underflow? For example, I have: char c = random byte; c += 0xB; In case c <= 0xF4, this will work well, but any value above that would cause…
Brave Heart
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In Assembly, How do i get past the -128 to 127 range?

So I have this declaration in .bss answer resb 1 In answer, I store the results of the sum of 2 digit integers ranging from -99 to +99. When I try adding +99 and +99, the answer becomes negative. Any answer within the -128 to 127 range are…
ejandra
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How can I detect lost of precision due to rounding in both floating point addition and multiplication?

From Computer Systems: a Programmer's Perspective: With single-precision floating point the expression (3.14f+1e10f)-1e10f evaluates to 0.0: the value 3.14 is lost due to rounding. the expression (1e20f*1e20f)*1e-20f evaluates to +∞ , while…
Tim
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