prog.c: In function ‘main’:
prog.c:7: warning: implicit declaration of function ‘getch’
prog.c:8: warning: implicit declaration of function ‘prinf’
/home/NDRAxk/ccdFBQei.o: In function `main':
prog.c:(.text+0x1c): undefined reference to `prinf'
prog.c:(.text+0x21): undefined reference to `getch'
collect2: ld returned 1 exit status