CSC110 1VH 8870 HW Set 07

Additional Problem

Write a program to generate 10 random numbers from -100 to 100. Save the randomly generate numbers in a list. Create a function to count how many odd numbers are in a list. Create a function to count how many even numbers are in the list. Create a function to sum up all the even numbers in the list as well.

Problem 9

Write a function print_triangular_numbers(n) that prints out the first n triangular numbers. A call to print_triangular_numbers(5) would produce the following output:

1    1
2    3
3    6
4    10
5    15

Problem 10

Write a function, is_prime, which takes a single integer argument and returns True when the argument is a prime number and False otherwise. Add tests for cases like this:

test(is_prime(11), True)
test(is_prime(35), False)
test(is_prime(19911129), True)

Problem 16

Write a function sum_of_squares(xs) that computes the sum of the squares of the numbers in the list xs. For example, sum_of_squares([2, 3, 4]) should return 4+9+16 which is 29:

test(sum_of_squares([2, 3, 4]), 29)
test(sum_of_squares([ ]), 0)
test(sum_of_squares([2, -3, 4]), 29)