Error!

prog.c: In function ‘main’:
prog.c:4:8: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
    4 |   int A.;
      |        ^
prog.c:4:8: error: expected expression before ‘.’ token
prog.c:5:8: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
    5 |   int B.;
      |        ^
prog.c:5:8: error: expected expression before ‘.’ token
prog.c:6:8: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
    6 |   int C.;
      |        ^
prog.c:6:8: error: expected expression before ‘.’ token