Part A:
Complete the calculator program that is provided to you by implementing the following
capabilities:
• Show the list of available options (B, U, A, V, E) to the user.
• Receive the user's option and act accordingly o If the user enters B, then get two numbers
and one operator, calculate and show the result

? Numbers could be any floating-point values.
? Valid binary operators could be + for addition, - for subtraction, * for
multiplication, / for division, % for the remainder, P for power, X for maximum,
and I for the minimum.
? Depending on the inputs' values for numbers and operators, the program should
check them for invalid inputs. If an input is invalid, show a proper message and
ask for another input. This process should be done repeatedly for every input
until a valid input is entered. For instance, if instead of a number user enters a
non-numeric string, the program should not accept it. Another example of
invalid input happens when the operator is division, and the denominator is
zero.

o If the user enters U, then get one number and one unary operator, calculate and show
the result
? The number could be any floating-point value.
? Valid unary operators could be S for square root (√x), L for logarithm (logx),
E for exponentiation (e!), C for the smallest integer value greater than or equal

to x, or F for the largest integer value greater than or equal to x.
? Depending on the inputs' values for numbers and operators, the program
should check them for invalid inputs. If an input is invalid, show a proper
message and ask for another input. This process should be done repeatedly for
every input until a valid input is entered. For instance, if the user enters S for
square root and enters a negative number, it is an invalid number.

o If the user enters V, then get a single alphabetic character for the name of a variable and
a number as its initial value.
? The number could be any floating-point value.
? Variable names could be any single alphabetic character between 'a' to 'e'.
? Depending on the inputs' values for numbers and variable names, the program
should check them for invalid inputs. If an input is invalid, show a proper
message and ask for another input. This process should be done repeatedly for
every input until a valid input is entered. For instance, if the user enters a
number for a variable name, this is an invalid input.

o If the user enters A, the program should ask for three selections, B, U or E.
? If the user enters B or U, then the rest of the process is similar to binary or
unary operation, respectively, that have already been explained. The only
difference is that the user can enter the name of a variable that has already
been declared with an initial value for a number as well. If the user enters a
variable that has not been declared, you can assume zero for its initial value.
The same validity checking process should be done, as explained in previous
steps.
? If the user enters E, the program exits from this part and goes back to the main
selection menu.

o If the user enters E, then the program will be terminated.

OBJECTIVE:
Through three assignments, we will learn how to apply the concepts learned in this course to
develop a simple command-line calculator using the programming language C.
In the third assignment, we are going to complete the calculator program we developed in the first
two assignments. This version will cover array variables and user-defined functions.

1- Write function to show the list of available options (B,U, V, A, E). Then whenever you
need it in the main program, call that function. This function should return the user
selection as a single uppercase character, B, U, V, A, E. If a user enters an invalid character,
the function needs to show a proper message and gets another input. This means, the
function won't exit unless a valid character is selected.
2- Convert cases B, U, and E to separate functions and call them in the main program,
whenever is needed. For example, for case B, you need to write a function that receives
three parameters, two float numbers, and one operator (character), and returns the result of
such calculation in a float format. The function also will check the parameters and show
proper messages if any of them are invalid, as described in assignment 2. Then whenever
the user selects B in the main program, the inputs will receive from the user, and then this
function will be called and processed.

ONLY NEED THE ANSEWRS FOR THE SECOND PART

pur-new-sol

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