in c++. Do only for part 1

LIVIU Due: Thu, Mar 8, 2:30 p.m. 1. (28%) Create a program that evaluates a simple arithmetic expression. More precisely, the program reads from the user a line of text that's sup- posed to contain two numbers separated by an arithmetic operator. The program then prints back the expression and its value, as in 35.6 + 12 = 47.6 The program should verify that the input line contains two numbers, one operator and nothing else. There can be whitespace before the first num- ber, after the second number and between each number and the operator. The operator can be either +, -, * or /. In case of an error, the program should print Invalid expression and quit. Use string streams. 2. (48%) Add some error-checking to the class Song you created in the pre- vious assignment by doing the following