Question

Write a C program that finds the odd, composite numbers between 10 and 500 in xterm

a. Composite means it is not prime, i.e., “C” is composite if there exists an A and B such that A>1, B>1, and A*B = C.

b. Odd means that it is not divisible by 2.

c. Therefore “odd, composite”, means both odd and composite''

Output should be:

15 is a composite number.
21 is a composite number.
25 is a composite number.
27 is a composite number.
33 is a composite number.
35 is a composite number.

and so on

Answer 1

#include <stdio.h>

//function to check a numebr is prime or not
int checkPrime(int n)
{
   int i;
   for(i = 2; i <= n/2; i++)
   {
       if(n % i != 0)
           continue;
       else
           return 1;
   }
   return 0;
}
int main()
{
//variable declaration
int i;
//display the number
   for(i=10; i<=500; i++)
   {
   //if the numebr is odd and composite both
   if(i%2!=0 && checkPrime(i))
   printf("%d is a odd and composite number\n", i);
   else
   {
   //if the number is odd number
   if(i%2!=0)
   printf("%d is a odd number\n", i);
   //if the number is composite number
   if(checkPrime(i))
   printf("%d is a composite number\n", i);
   }
   }
   return 0;
}

OUTPUT:

10 is a composite number                                                                                                        

11 is a odd number                                                                                                              

12 is a composite number                                                                                                        

13 is a odd number                                                                                                              

14 is a composite number                                                                                                        

15 is a odd and composite number                                                                                                

16 is a composite number                                                                                                        

17 is a odd number                                                                                                              

18 is a composite number                                                                                                        

19 is a odd number                                                                                                              

20 is a composite number                                                                                                        

21 is a odd and composite number                                                                                                

22 is a composite number                                                                                                        

23 is a odd number                                                                                                              

24 is a composite number                                                                                                        

25 is a odd and composite number                                                                                                

26 is a composite number                                                                                                        

27 is a odd and composite number                                                                                                

28 is a composite number                                                                                                        

29 is a odd number                                                                                                              

30 is a composite number                                                                                                        

31 is a odd number                                                                                                              

32 is a composite number                                                                                                        

33 is a odd and composite number                                                                                                

34 is a composite number                                                                                                        

35 is a odd and composite number                                                                                                

36 is a composite number                                                                                                        

37 is a odd number