use c++ please

Write a unit conversion program that asks which unit to convert from (fl. ox, gal, oz, lb, in, ft, mi) and which unit to convert to (ml,1,g, kg, mm, cm, m, km). Reject incompatible conversions such as gal to km. Also ask for value to be converted and display answer. Write a program that translates a letter grade into a number grade. Letter grades are A, B, C, D, and F, possibly folled by + or - Their numberic values are 4, 3, 2, 1, and 0. There is no F+ or F-, A + increases the numeric value by .3 while a - decreses it by.3. An A+ has a value of 4.0