13 questions
0
votes
1
answer
107
views
printf returns 6 instead of 0 when assigning a null string
Why does printf function return 6 instead of 0 when assigning NULL as string to it, although its printing nothing?
int main(void)
{
int x;
x = printf("%s", NULL);
printf ("\...
- 3
-1
votes
1
answer
689
views
Unmarshalling a sql.NullTime struct in Go
Given
type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}
and
type PayinCount struct {
DateShiftStart sql.NullTime `json:"dateShiftStart"`...
- 5,347
1
vote
2
answers
413
views
jQuery serialize method returns null
I am trying to submit the form using jQuery but the serialize method returns null. What's going wrong? Help is very much appreciated.
Here is my code.
HTML / PHP code
<TR>
<FORM id="...
- 23
0
votes
3
answers
75
views
How to pass a string to function and then check if it is equal to a string
#include <stdio.h>
typedef struct ComplexNumber_S
{
float realNumber;
float img;
} ComplexNumber;
/**
* @brief gets a number
* @return the input number
*/
float GetNumber()
{
float ...
- 13
6
votes
2
answers
918
views
Why does [NullString]::Value evaluate differently with a breakpoint?
I've tried this code in PowerShell ISE and VS Code with the same strange result. Without a breakpoint, the output is EMPTY, but with a breakpoint in the line with "NULL", the output is NULL (as ...
- 319
0
votes
1
answer
368
views
Simple string return function with default param passed as NULL, returns NULL instead of string
I have the following function:
CREATE OR REPLACE FUNCTION public.get_string(cmd_type text, udf_name text,
group_name character varying DEFAULT 'usage'::character varying)
RETURNS text
LANGUAGE ...
- 581
0
votes
0
answers
3k
views
C++ Aborted with basic_string::_M_Construct null not valid
There are some questions with the same error but no one matches with my case.
I have two classes: Loader and Processor. The loader loads a vector of string. The processor calls, in the constructor, ...
- 181
15
votes
3
answers
31k
views
JsonConvert.SerializeObject: Unexpected result when Serializing null value
In the line of code below, my string x ends up being an actual string "null" when clInitializer.AVOptions = null value:
string x = JsonConvert.SerializeObject(clInitializer.AVOptions, new ...
- 459
8
votes
2
answers
6k
views
C# 7 switch case with null checks
C#7 introduces a new feature called patterns, which you can use with Is-Expression or Switch cases like this:
string str = null;
switch(str){
case string x:
Console.WriteLine("string " + ...
- 409
1
vote
1
answer
531
views
EnumDisplayDevices - passing null causes error
The MSDN documentation for EnumDisplayDevices states that passing NULL as the first parameter to the function returns information about the display adaptor(s) on the machine (passing a string returns ...
- 55
2
votes
1
answer
1k
views
Passing null string value via environment variable to TSQL script
I have a DOS batch file I want to use to invoke a TSQL program.
I want to pass the names of the databases to use. This seems to work.
I want to pass the PREFIXES for the names of the tables I want to ...
- 1,994
9
votes
7
answers
19k
views
String.IsNullOrEmpty(myString) Vs myString != null
Which one is better among these three?
string myString = "";
String.IsNullOrEmpty(myString);
vs
string myString = "";
if(myString.Length > 0 || myString != null)
vs
string myString = "";
if (...
- 22k
1
vote
3
answers
3k
views
Error with StringBuilder -- String Not Being Appended
Working with long strings and found this problem. Any advice?
I have an instance where a string builder's Capacity is 1024 and Length is 992.
I am .Append() a string that has a .Length property of ...
- 13.4k