add makefiles
write sorted insert into int vector
add comments
write code to find modes
make function prototypes consistent
fix off-by-one error in insertion code
fix remaining bugs in insert code
write main()
add ignores
fix typo
define struct and declare basic variables
write item maker
clear input buffer after taking input
write printing of cart
write total printing code
prettify cart printing
change function to void
write main function
price and quantity must be positive
add some whitespace