a function-definition is not allowed here before '{' token

[ozyMoG1T]

I tried to run the program, it showed something like this:
In function 'int main()':
41:13: error: a function-definition is not allowed here before '{' token
57:62: error: 'reverse' was not declared in this scope

Can someone please help me to fix this problem?

Thank you.

[Hippogriff]

In future please keep all of this in 1 thread, you have 3+ separate questions about the same program.

http://www.cplusplus.com/forum/beginner/174084/
http://www.cplusplus.com/forum/beginner/174067/

int reverse( int number, int reverse_so_far = 0 )
{
         if( number < 0 ) return -reverse( -number ) ;
                
         if( number < 10 ) return reverse_so_far*10 + number ;     
            return reverse( number/10, reverse_so_far*10 + number%10 ) ;
}

You can't define a function inside another function, move it outside of main.

[Bdanielz]

This might get you started...
You did not declare the function reverse in the correct spot.
See this for more info.

http://www.cplusplus.com/doc/tutorial/functions/

let me know if you have any questions.