prog.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
main ()
^~~~
prog.c: In function ‘main’:
prog.c:9:2: warning: implicit declaration of function ‘getch’; did you mean ‘getc’? [-Wimplicit-function-declaration]
getch();
^~~~~
getc
prog.c:6:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d" , &a, &b);
^~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /home/yWTidI/cccUldzw.o: in function `main':
prog.c:(.text.startup+0x5c): undefined reference to `getch'
collect2: error: ld returned 1 exit status