Main.c: In function 'main':
Main.c:19:27: error: 'M_1_PI' undeclared (first use in this function)
printf("%lf\n", sin(n1*M_1_PI / 180));
^
Main.c:19:27: note: each undeclared identifier is reported only once for each function it appears in
_USE_MATH_DEFINES은 표준방식이 아니기때문에
일부컴파일러에서는 지원하지 않는다고합니다.
