i just started c++ about 2 weeks ago and ive made the following programs...

hello world
add,subtract,divide,multiply calculator
my very own reverse a string function
count how many times a certain character appears within a string
remove a certain character within a string
random prime and non-prime generator

now im stuck for ideas on what i should make next. could someone give me some ideas please! im only a beginner so please do not give me something isn't too hard hehe.