Question

Use MATLAB to program the following:

9. The MATLAB built-in function primes (x) finds all the prime numbers less than x. Write a M-file function "addupprime" that will sum up all the prime numbers of an input number x. Run and show 2 test cases to demonstrate that your function file is correct.

Answer 1

This code should be saved with filename as addupprime only

Code :-

function sum_prime = addupprime(x)
    prime_num = primes(x); % finding all prime number
    sum_prime = 0; % intialization of sum_prime
    for i = prime_num     % for loop for add all prime number
      sum_prime = sum_prime + i;
    end
end

Output: -

>> addupprime(50)
ans = 328
>> addupprime(100)
ans = 1060
>>