You are to write a C++ program to calculate the monthly car payment(s) for a customers.. You have read ahead in your textbook and know that it would be really neat to use functions for this task. Unfortunately you have not had functions yet and you must resort to a linear straight-line program. (In other words, you are not to use functions.) As much as possible you are to develop the code as modular building blocks. You are encouraged to use functional decomposition to design your program. You are to use no global variables in your work. You should manually calculate some values to ensure that your program is working correctly. Your overall program structure will consist of:• Declarations and initializations• Input price of vehicle• Input trade in value• Input down payment• Input annual interest rate• Calculate monthly loan payments• Display (output) resultsAll input routines are to have informative and clear instructions for entering values. The input routines are to keep the user in the routine until an entry is valid. Your program should be well organized, use the suggested variable names, proper indentations, and appropriate comments. You are to use the concepts we have covered in the first seven chapters and are not to use capabilities found in chapters eight through twelve (such as functions, enums, arrays, structs, or classes). The input of all variables is via the keyboard (cin). The display routine is to use cout via the standard monitor.