How to take mod for double data type in C

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i want to take mod of double data type to check if its even or not.

What I have tried:

sry for that...

#include <stdio.h>

 
int main()
{
     long n;
    scanf("%d",&n);
    while(n--){
        double g;
        scanf("%d",&g);
        if(((int)g)%2==0)
        printf("YES\n");
        else
        printf("NO\n");
        
    }
}

Constraints
1<=n<=100000
1<=g<=10^100

here n is the no. of test case
and g is the no. to check whether its even or not.
sirr its not working.

Posted 1-Sep-17 2:39am

jatinp510

Updated 1-Sep-17 4:12am

jeron1

v3

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jeron1 1-Sep-17 10:24am

Is the constraint for g correct, 10 to the 100th power?

CPallini 1-Sep-17 13:30pm

As jeron1 noticed, you cannot hold such big numbers in a double variable.

jatinp510 2-Sep-17 0:27am

which data type i have to use to hold value for 10^100.

jeron1 2-Sep-17 11:53am

You would need something like GitHub - sercantutar/infint: Arbitrary-Precision Integer Arithmetic[^] (I've not used it personally, so I don't know how well it works). You could Google 'c++ bigint' and see what comes up.

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OriginalGriff · Accepted Answer · 2017-09-01T02:47:00

Solution 1

Convert it to an int by casting, and use the integer modulus operator "%":

C++

if (((int) myDouble) % 2 == 0)
   {
   // It's even.
   ...

And BTW: do not swear on this site again: it was unnecessary, unprofessional, and unwanted. Do it again and you will be treated as a troll, and banned from the site.

Posted 1-Sep-17 2:47am

OriginalGriff

Comments

jatinp510 1-Sep-17 9:07am

sry for that...

#include <stdio.h>

int main()
{
long n;
scanf("%d",&n);
while(n--){
double g;
scanf("%d",&g);
if(((int)g)%2==0)
printf("YES\n");
else
printf("NO\n");

}
}
Constraints
1<=n<=100000
1<=g<=10^100

here n is the no. of test case
and g is the no. to check whether its even or not.
sirr its not working.

Jochen Arndt 1-Sep-17 9:48am

The error is at

scanf("%d",&g);

You are reading an int and store it at a memory location for a double.
Use

scanf("%lf",&g);

instead to tell scanf that it should convert a double.

jatinp510 1-Sep-17 10:08am

ITS STILL NOT WORKING

OriginalGriff 1-Sep-17 10:09am

DON'T SHOUT. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalization if you want to be taken seriously.

jatinp510 1-Sep-17 10:11am

Okay. :)

jatinp510 1-Sep-17 9:07am

give me some hints

CPallini · Accepted Answer · 2017-09-01T03:54:00

Solution 2

Doubles aren't even or odd (they are with near zero probability). You have to convert them to integers. The way you do it may bias the result: you may choose, for instance to truncate the double value (as Griff suggested) or to round it.

Posted 1-Sep-17 3:54am

CPallini