F= p * pow((1 + i),t) where f is the future value, p is the present value, i is the monthly interest rate and t is the number of months. your program will need to make sure of better variable names that those used above. the input for the program will be read in from a file. the program will write out to cout with a prompt. you will read in the file name from cin. you will then read in the present value, monthly interest rate, and the number of months from the input file. there may be multiple sets of these values. you need to process them all. the program should end when you reach the end of file on the input file. the output from the program will be written to two different places. any error messages will be written to cout. you will also be writing out to a file called output. xls. the first thing you will write out are four "headings" separated by tabs (using the \t escape sequence). here is an output statement (this example is using cout). your program will instead write to the output file.