emacs - How can I adjust indentation of my c source code in the entire selected block all at once? -

i'd adjust indentation of source code correctly @ time after select block of it. there function or key can including parenthesis?

here original selected block of sample code i'd adjust indentation.

while(1) {     func1();     if( )     {         func2();        }              }  if( x == 0 )   {       aa = 1;   } 

this correctly indented code how want adjust.

while(1) {     func1();     if( )     {         func2();     }  }  if( x == 0 ) {     aa = 1; } 

select code , press c-m-\, should bound indent-region:

c-m-\

indent lines in region, though had typed tab @ beginning of each line (indent-region).

if numeric argument supplied, indent every line in region column number.