PLEASE INCLUDE THE FULL PROGRAM INCLUDING THE INPUT AND OUTPUT REDIRECTION METHOD

Programming In C

Lab $3$B

Objective

To gain expertise in the use of repetition, character processing, functions, parameter passing, input$/$output

redirection and command line.

Assignment

Write a program to perform a simple arithmetic calculation. The user is to enter a simple expression $-$ integer

operator integer $-$ such as: $15+30$

The program is to extract the $2$ operands and the operator one character at a time, perform the indicated

calculation and display the result or print out an appropriate error message. For example: $15+30=45$

Operators should include $+-*/\%$

Operands are positive integers, no sign

Use getchar$()$ function to read the expression

Use putchar$()$ function to output the expression

Expression will have variable spacing before the first operand, between operator and operands and

after the second operand $($zero$,$ one or more spaces$).$

Your program needs to be in a loop asking whether the user wants to enter another expression with a

Y$//$N type of an answer $($one character$).$

Code a function for each operator to do the appropriate operation $(5$ functions$).$

No global variables, arrays, string and$/$or character handling functions may be used in this lab.

Your program needs to generate an appropriate error message if the expression is invalid.

You may ONLY use getchar$()$ and putchar$()$ functions for reading and writing the expression. You may

use scanf$()$ and printf$()$ functions for user prompts, error messages, etc.

Input

One expression at a time with user prompts to repeat.

Output

The whole expression entered by the user EXACTLY as typed in $($including spaces$),$ the result or an appropriate

error message. Need to show all test cases and scenarios for valid and invalid expressions $($there are many$)$

and how your program handled it$.$

Run

Create an input file of all valid and invalid expressions and answer to user prompts. Run the program on the

command line using input$/$output redirection:

Lab$3$b$.$exe $$ lab$3$b$\_$input.txt $>$ lab$3$b$\_$output.txt

Turn In

Turn in source code, input file and output file.