HELLO THIS IS MY CODE BUT IT KEEPS GETTING STUCK IN AN INFINITE LOOP WHEN RUNNING INPUT$/$OUTPUT REDIRECTION PLEASE HELP!

#include

$//$ Function prototypes for operations

int add$($int a$,$ int b$)$;

int subtract$($int a$,$ int b$)$;

int multiply$($int a$,$ int b$)$;

int divide$($int a$,$ int b$)$;

int modulus$($int a$,$ int b$)$;

void printError$($char$*$ message$)$;

$//$ Main function

int main$()\{$

char ch$,$ operator;

int operand$1=0,$ operand$2=0,$ result $=0$;

char response;

do $\{$

$//$ Reset variables for each loop iteration

operand$1=$ operand$2=0$;

operator $=\text{'}\backslash 0\text{'}$;

printf$("$Enter expression $($e$.$g$.,15+30)$: $")$;

$//$ Read first operand

while $(($ch $=$ getchar$())==\text{'}\text{'})$; $//$ Skip leading spaces

if $($ch $>=\text{'}0\text{'}$ && ch

operand$1=$ ch $-\text{'}0\text{'}$;

while $(($ch $=$ getchar$())>=\text{'}0\text{'}$ && ch

operand$1=$ operand$1*10+($ch $-\text{'}0\text{'})$;

$\}$

$\}$

else $\{$

printError$("$Invalid first operand."$)$;

continue;

$\}$

$//$ Read operator $($skip spaces before it$)$

while $($ch $==\text{'}\text{'})$ ch $=$ getchar$()$;

if $($ch $==\text{'}+\text{'}||$ ch $==\text{'}-\text{'}||$ ch $==\text{'}*\text{'}||$ ch $==\text{'}/\text{'}||$ ch $==\text{'}\%\text{'})\{$

operator $=$ ch;

$\}$

else $\{$

printError$("$Invalid operator."$)$;

continue;

$\}$

$//$ Read second operand

while $(($ch $=$ getchar$())==\text{'}\text{'})$; $//$ Skip spaces before operand

if $($ch $>=\text{'}0\text{'}$ && ch

operand$2=$ ch $-\text{'}0\text{'}$;

while $(($ch $=$ getchar$())>=\text{'}0\text{'}$ && ch

operand$2=$ operand$2*10+($ch $-\text{'}0\text{'})$;

$\}$

$\}$

else $\{$

printError$("$Invalid second operand."$)$;

continue;

$\}$

$//$ Perform the calculation

switch $($operator$)\{$

case $\text{'}+\text{'}$: result $=$ add$($operand$1,$ operand$2)$; break;

case $\text{'}-\text{'}$: result $=$ subtract$($operand$1,$ operand$2)$; break;

case $\text{'}*\text{'}$: result $=$ multiply$($operand$1,$ operand$2)$; break;

case $\text{'}/\text{'}$:

if $($operand$2==0)\{$

printError$("$Division by zero."$)$;

continue;

$\}$

result $=$ divide$($operand$1,$ operand$2)$;

break;

case $\text{'}\%\text{'}$:

if $($operand$2==0)\{$

printError$("$Modulus by zero."$)$;

continue;

$\}$

result $=$ modulus$($operand$1,$ operand$2)$;

break;

default:

printError$("$Unknown error."$)$;

continue;

$\}$

$//$ Output the result

printf$("$Result of expression: $\%$d $\%$c $\%$d $=\%$d

$",$ operand$1,$ operator, operand$2,$ result$)$;

$//$ Ask user if they want to continue

printf$("$Do you want to enter another expression? $($Y$/$N$)$: $")$;

while $(($response $=$ getchar$())==\text{'}\text{'})$; $//$ Skip spaces

while $($getchar$()!=\text{'}$

$\text{'})$; $//$ Clear input buffer

$\}$ while $($response $==\text{'}$Y$\text{'}||$ response $==\text{'}$y$\text{'})$;

return $0$;

$\}$

$//$ Operation functions

int add$($int a$,$ int b$)\{$

return a $+$ b;

$\}$

int subtract$($int a$,$ int b$)\{$

return a $-$ b;

$\}$

int multiply$($int a$,$ int b$)\{$

return a $*$ b;

$\}$

int divide$($int a$,$ int b$)\{$

return a $/$ b;

$\}$

int modulus$($int a$,$ int b$)\{$

return a $\%$ b;

$\}$

$//$ Function to print an error message

void printError$($char$*$ message$)\{$

printf$("$Error: $\%$s

$",$ message$)$;

while $($getchar$()!=\text{'}$

$\text{'})$; $//$ Clear input buffer

$\}$ 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: $\backslash (15+30\backslash )$

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: $\backslash (15+30=45\backslash )$

$-$ Operators should include $+-*/\backslash \%$

$-$ 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 $\backslash (\backslash$mathrm$\{$Y$\}/\backslash$mathrm$\{$N$\}\backslash )$ 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 an