$1.$ Write a C$++$ program that defines value$-$returning functions for the arithmetic integer binary operations plus, minus, multiply, and divide. You should also write a value returning function for the unary operation negate. Use your function declarations to compute the following as a single expression: $(((54)*(8/2))+7)$

Your main function should not declare a single variable, but it should print as output the result of computing this expression. Your implementation is correct if your output yields the value $11.$