3. Practice



Answer:
    -23 - 3
The first minus sign is "negation" and the second minus sign is "subtraction". The spaces in the 
 expression emphasize the different roles, but are not necessary. The following expression is 
equivalent:
    -23-3






Practice





    

    

    

        
Examine the following expressions. Assume that each variable has already been correctly declared. Decide if the expression is correct, then click on the button.

        
        

        


            

                
                    

                        Expression
                        Correct or Not Correct?
                        Expression
                        Correct or Not Correct?
                    

                    

                        25
                        
                        25 - value
                        
                    

                    

                        2( a - b )
                        
                        (a-b) * (c-d)
                        
                    

                    

                        A - b/c + D
                        
                        -sum + partial
                        
                    

                    

                        ((x+y) / z) / (a - b)
                        
                        ((m-n) + (w-x-z) / (p % q)
                        
                    

                
            

        

        


        

    





    















Question 3:
Are arithmetic expressions the only kind of expression?