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difference between *b= *b+1 and *b++


By : Abigail
Date : July 31 2020, 04:00 AM
will be helpful for those in need They are not the same, the first expression is just manipulating your pointer due to operator precedence.
code :
*b++;     // acts like *(b++)
(*b)++;


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Would there be any difference or performance difference between these 2 web page load method - c# - html agility pack


By : Dalcon
Date : March 29 2020, 07:55 AM
Any of those help There isn't difference between the two ways. HtmlWeb.Load(string url) internally calls HtmlDocument.Load(TextReader reader) as the following HtmlWeb.Load(string url) call stack, which I used .NET Reflector to see.
code :
HtmlWeb.Load(string url)
----> HtmlDocument.Load(string url, Encoding encoding(=this.OverrideEncoding))
----> HtmlDocument.Load(TextReader reader)

What's the difference between input/output streams and ordinary reader and writer and what's the difference between thei


By : karim
Date : March 29 2020, 07:55 AM
it should still fix some issue Streams read/write bytes, while Readers read and Writers write character data. Since underneath it all you always have bytes when doing I/O, this means that readers and writers do an additional step of converting bytes to characters.
There are abstract super-classes for both cases (the ones I just linked), with various subclasses, not just for streams -- you can see for yourself in the Javadoc, each page lists sub-classes for all of these.

calculate difference in dates, get difference in hours mins and seconds - ideally by js, otherwise moment.js


By : michael.kobol
Date : March 29 2020, 07:55 AM
I hope this helps you . Matt has linked to a duplicate for moment.js, so this is just a POJS solution.
UNIX time values are seconds since the epoch, ECMAScript time values are milliseconds since the same epoch. All you need to do is convert both to the same unit (either seconds or milliseconds) and turn the difference into hours, minutues and seconds.
code :
var then = 1475366400,        // Unix time value for 2016-10-02T00:00:00Z
    now  = Date.now(),        // Current time value in milliseconds
    diff = now - then*1000,   // Difference in milliseconds
    sign = diff < 0? '-' : '';
diff *= sign == '-'? -1 : 1;
var hrs  = diff/3.6e6 | 0,
    mins = diff%3.6e6 / 6e4 | 0,
    secs = diff%6e4 / 1e3  ;

// Helper to pad single digit numbers
function z(n){return (n<10?'0':'') + n}

console.log(sign + hrs + ':' + z(mins) + ':' + z(secs));

Show complete rows highliting difference between dataframes df1 , df2 , but only when difference in row's cell exists


By : Anil Patil
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can use this brilliant solution:
code :
def report_diff(x):
    return x[0] if x[0] == x[1] else '{}->{}'.format(*x)

In [70]: pd.Panel(dict(df1=df1,df2=df2)).apply(report_diff, axis=0)
Out[70]:
   1     2
0  a  c->d
1  a     c
In [73]: df1
Out[73]:
   A  B  C
0  a  c  1
1  a  c  2
2  1  2  3

In [74]: df2
Out[74]:
   A  B  C
0  a  d  1
1  a  c  2
2  1  2  4

In [75]: pd.Panel(dict(df1=df1,df2=df2)).apply(report_diff, axis=0)
Out[75]:
   A     B     C
0  a  c->d     1
1  a     c     2
2  1     2  3->4
In [54]: mask = df1.ne(df2).any(1)

In [55]: mask
Out[55]:
0     True
1    False
2     True
dtype: bool

In [56]: pd.Panel(dict(df1=df1[mask],df2=df2[mask])).apply(report_diff, axis=0)
Out[56]:
   A     B     C
0  a  c->d     1
2  1     2  3->4

The two time difference calculation gives error when the difference is 9 in hours, minutes or seconds in javascript


By : Srdjan Milic
Date : March 29 2020, 07:55 AM
Does that help I changed the < (smaller) operator for <= (smaller or equal) about the leading zeros...
I also added a isNaN() condition to return an empty string if the caculation ends with a NAN (Not a Number).
code :
window.onchange = function () {
  var start = document.getElementById("tcin").value;
  var end = document.getElementById("tcout").value;

  function diff(start, end) {
    start = start.split(":");
    end = end.split(":");
    var startDate = new Date(0, 0, 0, start[0], start[1], start[2] ? start[2] : 0, 0);
    var endDate = new Date(0, 0, 0, end[0], end[1], end[2] ? end[2] : 0, 0);

    //para que el cálculo funcione si la hora final se cruza al día siguiente. Por ejemplo. 11pm a 2am
    if (endDate.getTime() < startDate.getTime()) {
      endDate.setDate(endDate.getDate() + 1);
    }

    var diff = endDate.getTime() - startDate.getTime();

    var hours = Math.floor(diff / 1000 / 60 / 60);
    diff -= hours * 1000 * 60 * 60;
    var minutes = Math.floor(diff / 1000 / 60);
    diff -= minutes * 1000 * 60;
    var seconds = Math.floor(diff / 1000);

    if(!isNaN(hours) && !isNaN(minutes) && !isNaN(seconds)){
      return (hours <= 9 ? "0" : "") + hours + ":" + (minutes <= 9 ? "0" : "") + minutes + ":" + (seconds <= 9 ? "0" : "") + seconds;
    }else{
      return "";
    }

  }
  document.getElementById("tcresult").value = diff(start, end);
}
in:<input id="tcin"><br>
out:<input id="tcout"><br>
result:<input id="tcresult"><br>
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