The comment explains what the following loop does. Use a function instead.

$```$

$//$ Counts the number of spaces

int spaces $=0$;

for $($int i $=0$; i $$ input.length$()$; i$++)$

$\{$

if $($input$.$substr$($i$,1)=="")\{$ spaces$++$; $\}$

$\}$

$```$

$```$

int count$\_$char$($const string& str$,$ char c$)\{$

int count $=0$;

for $($int i $=0$; i $$ str$.$length$()$; i$++)\{$

if $($str$[$i$]==$ c$)\{$

count$++$;

$\}$

$\}$

return count;

$\}$

int main$()$

$\{$

string str;

getline$($cin$,$ str$)$;

cout $$ count$\_$spaces$($str$)$ endl;

return $0$;

$\}$

$```$

$\backslash (\backslash$times $\backslash )$ Failed to compile

$```$

helper$\_$function.cpp: In function 'int main$()\text{'}$:

helper$\_$function.cpp:$24$:$12$: error: 'count$\_$spaces' was not declared in this scope

$24|$ cout $$ count$\_$spaces$($str$)$ endl;

$^$ ~ ~ ~ ~ ~ ~

$```$

Note: Although the reported line number is in the uneditable part of the code, the error actually exists in your code. Tools often don't recognize the problem until reaching a later line.