The given problem is a calculator program in C that encounters issues with input for certain operations and lacks proper handling for unary and binary operations. $$n example iy should be calculate sin cos log$...$ but i cant even write a input. Here is the code: #include

#include

$//$ Function declarations

double add$($double num$1,$ double num$2)$;

double subtract$($double num$1,$ double num$2)$;

double multiply$($double num$1,$ double num$2)$;

double divide$($double num$1,$ double num$2)$;

double sine$($double angle$)$;

double cosine$($double angle$)$;

double tangent$($double angle$)$;

double logarithm$($double num$)$;

double squareRoot$($double num$)$;

double power$($double base, double exponent$)$;

int main$()\{$

char op;

double num$1,$ num$2,$ result;

printf$("$Enter an operator $(+,-,*,/,$ sin$,$ cos$,$ tan$,$ log$,$ sqrt$,$ pow$)$: $")$;

scanf$("\%$c$",$ &op$)$;

if $($op $!=\text{'}$s$\text{'}$ && op $!=\text{'}$c$\text{'}$ && op $!=\text{'}$t$\text{'}$ && op $!=\text{'}$l$\text{'}$ && op $!=\text{'}$q$\text{'})\{$

printf$("$Enter two numbers: $")$;

scanf$("\%$lf $\%$lf$",$ &num$1,$ &num$2)$;

$\}$ else $\{$

num$2=0$;

printf$("$Enter a number: $")$;

scanf$("\%$lf$",$ &num$1)$;

$\}$

switch $($op$)\{$

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

result $=$ add$($num$1,$ num$2)$;

break;

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

result $=$ subtract$($num$1,$ num$2)$;

break;

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

result $=$ multiply$($num$1,$ num$2)$;

break;

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

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

printf$("$Error: Division by zero

$")$;

return $1$;

$\}$ else $\{$

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

$\}$

break;

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

result $=$ sine$($num$1)$;

break;

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

result $=$ cosine$($num$1)$;

break;

case $\text{'}$t$\text{'}$:

result $=$ tangent$($num$1)$;

break;

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

if $($num$1>0)\{$

result $=$ logarithm$($num$1)$;

$\}$ else $\{$

printf$("$Error: Logarithm undefined for non$-$positive numbers

$")$;

return $1$;

$\}$

break;

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

if $($num$1>=0)\{$

result $=$ squareRoot$($num$1)$;

$\}$ else $\{$

printf$("$Error: Square root undefined for negative numbers

$")$;

return $1$;

$\}$

break;

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

result $=$ power$($num$1,$ num$2)$;

break;

default:

printf$("$Invalid operator

$")$;

return $1$;

$\}$

$//$ Output the result

printf$("\%\mathrm{.}2$lf $\%$c $\%\mathrm{.}2$lf $=\%\mathrm{.}2$lf

$",$ num$1,$ op$,$ num$2,$ result$)$;

return $0$;

$\}$

double add$($double num$1,$ double num$2)\{$

return num$1+$ num$2$;

$\}$

double subtract$($double num$1,$ double num$2)\{$

return num$1-$ num$2$;

$\}$

double multiply$($double num$1,$ double num$2)\{$

return num$1*$ num$2$;

$\}$

double divide$($double num$1,$ double num$2)\{$

return num$1/$ num$2$;

$\}$

double sine$($double angle$)\{$

return sin$($angle $*$ M$\_$PI $/180\mathrm{.}0)$;

$\}$

double cosine$($double angle$)\{$

return cos$($angle $*$ M$\_$PI $/180\mathrm{.}0)$;

$\}$

double tangent$($double angle$)\{$

return tan$($angle $*$ M$\_$PI $/180\mathrm{.}0)$;

$\}$

double logarithm$($double num$)\{$

return log$($num$)$;

$\}$

double squareRoot$($double num$)\{$

return sqrt$($num$)$;

$\}$

double power$($double base, double exponent$)\{$

return pow$($base$,$ exponent$)$;

$\}$