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Use the following function to determine if a whole number is prime, including negative values:
bool isprime(int p)
{
if(p<0)
p*=(-1); // convert to positive integer
if( p<2 ( p>2 && p&1==0 ))
return( false );
int max = (int)sqrt((double) p)+1;
for( int i=3; i<=max; i+=2 )
if( p%i==0 )
return( false );
return( true );
}
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∙ 10y ago
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C plus plus code that determine prime number?
#include <iostream.h> main() { int a; cout<<"enter a number : "; cin>>a; cout<<endl; if (a%2-1) cout<<"it is a prime number"; else cout<<"it is not a prime number" return 0; } ------------------------------------------ output: enter a number : 30 it is a not a prime number
What are prime number and composite numbers?
a prime number is a number that you can plus by one
What prime number plus what prime number will give you 54?
47 + 7
What is prime plus prime?
A prime plus another prime is at the very least going to be an even number since all primes (with the exception of 2) are odd.
Does x squared plus x plus 41 always equal a prime number?
No. it's not a prime number when x = 40, 41, 81,82 ...
Is number 5x3x17 plus 17 a prime number?
No. (5x3x17) + 17 =255 + 17 =272 (This is not prime.)
Is 2187 plus 36295 a prime number?
No. The number 38,482 is composite.
What is the smallest number for n for which n2 plus n plus 17 is not a prime number?
n = 5.
Is 9x3 plus 12x2 a prime number?
yes
What is the sum of the smallest odd prime number and the largest prime number less than 100?
It is: 3 plus 97 = 100
What is P plus P plus N in prime numbers?
It would always be a natural number.
What prime number squared plus 3 gives an odd number?
22 + 3 = 7 Since 2 is the only even prime number, this is the only number for which this holds true.
