CodePudding user response:

 # include & lt; Stdio. H> 
# define P 
 3.14Int main (void) 
{
Double r; 
Printf (" Input "r" : "); 
//scanf_s (" % 1 f ", & amp; R); 
Lf scanf_s (" % ", & amp; R); 
Printf (" circumference=% f \ n ", 2 * P * r); 
Printf (" area=\ n % f ", r * r * P). 
return 0; 
}