What problems did you encounter while developing your solution? How do you plan to overcome them?/How did you overcome them?

Today I developed a Grocery List program that allows people to enter item prices and gives them the final total result. I used the printf method to print the Dollar sign and to limit the number of digits to two. I realized that to assign a value to a double primitive you use f instead of d (when using printf). And to signify integer, you use d. That resulted in an error, but I was able to see in and fix it.