Main.cc:6:17: warning: missing terminating ' character
    6 |   if(c>='a'&&c<='z) cout<<toupper(c)<<endl;
      |                 ^
Main.cc:6:17: error: missing terminating ' character
    6 |   if(c>='a'&&c<='z) cout<<toupper(c)<<endl;
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cc: In function 'int main()':
Main.cc:6:6: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
    6 |   if(c>='a'&&c<='z) cout<<toupper(c)<<endl;
      |      ^
Main.cc:7:3: error: expected primary-expression before 'else'
    7 |   else if(c>='A'&&c<='Z')cout<<tolower(c)<<endl;
      |   ^~~~
Main.cc:8:3: error: expected primary-expression before 'else'
    8 |   else{
      |   ^~~~
Main.cc:7:49: error: expected ')' before 'else'
    7 |   else if(c>='A'&&c<='Z')cout<<tolower(c)<<endl;
      |                                                 ^
      |                                                 )
    8 |   else{
      |   ~~~~                                           
Main.cc:6:5: note: to match this '('
    6 |   if(c>='a'&&c<='z) cout<<toupper(c)<<endl;
      |     ^
Main.cc:13:1: error: expected primary-expression before '}' token
   13 | }
      | ^