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tolga_ozsahin
Posts: **4**Member

in Pascal

Hello all,

I need help with a program to be written in Turbo Pascal:

"I need to write a program to accept a positive integer and gives its prime factorization, that is, expresses the integer as a product of primes or indicates that it is prime."

Any help would be appreciated.

Thanks,

Tolga

I need help with a program to be written in Turbo Pascal:

"I need to write a program to accept a positive integer and gives its prime factorization, that is, expresses the integer as a product of primes or indicates that it is prime."

Any help would be appreciated.

Thanks,

Tolga

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## Comments

6,349Member:

: I need help with a program to be written in Turbo Pascal:

: "I need to write a program to accept a positive integer and gives its prime factorization, that is, expresses the integer as a product of primes or indicates that it is prime."

:

: Any help would be appreciated.

:

: Thanks,

: Tolga

:

The easiest way to find out if a number is prime, is by dividing it by all the odd numbers upto half of that number:

[code]

var

Number: double;

Divisor, MaxDivisor: double;

begin

MaxDivisor := Trunc(Number/2);

Divisor := 3;

if Trunc(Number/2) = Number/2 then { Test if Number is even }

writeln('Number is no prime or is 2')

else

while Divisor < MaxDivisor do

begin

if Trunc(Number/Divisor) = Number/Divisor then

begin

writeln('Number is no prime');

Break;

end;

Divisor := Divisor + 2; {loop through all the odd numbers }

end;

end;

[/code]

The factorization can be done in a similar way. If the loop never indicates that the Number is a prime, then Divisor is one of its factors. All you now need to do is to show that Divisor and its counterpart (Number/Divisor) are primes to complete the prime factorization.