/in/ex1.c: In function 'SIGN':
/in/ex1.c:14:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/ex1.c: In function 'main':
/in/ex1.c:39:21: warning: 'result.imag' may be used uninitialized in this function [-Wmaybe-uninitialized]
         result.imag *= (-1);
                     ^~
/in/ex1.c:41:5: warning: 'result.real' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d%c%di",result.real,result.sign,result.imag);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~