prog.c: In function ‘main’:
prog.c:5:2: warning: implicit declaration of function ‘scaryf’ [-Wimplicit-function-declaration]
scaryf("%d",&n);
^~~~~~
/home/emzDCh/ccXj6HDW.o: In function `main':
prog.c:(.text.startup+0x2b): undefined reference to `scaryf'
prog.c:(.text.startup+0x69): undefined reference to `scaryf'
prog.c:(.text.startup+0x99): undefined reference to `scaryf'
prog.c:(.text.startup+0xe1): undefined reference to `scaryf'
collect2: error: ld returned 1 exit status