Programmer --- C language details 24 (segment error, type improvement, sizeof & amp; #39; A & amp; #39 ;)

Programmer --- C language details 24 (segment error, type improvement, sizeof & #39; A & #39 ;)
Main Content: Segment error, type improvement, sizeof 'A'

# Include

 
  
Int main () {union test {char a [10]; int B;} u; int * p = (int *) & (u. a [1]); // No Bus Error Caused * p = 17; printf ("% d \ n", * p); # if 0 int * q = 0; // cause a segment error. You can see the segment error when running in linux. * q = 1 is a direct error when running in windows; # endif/* test */printf ("% d \ n", sizeof 'A'); // The output is 4 (or the length of the int on your machine) // because of the type improvement, char changes to int char c1 = 'A', c2 = 'B'; char c3 = c1 + c2; // overflow, the value is 97 + 98-256 =-61 printf ("% d \ n", c1, c2, c3); return 0 ;}

 

Output: