Eroare de compilare: user.c: In function ‘main’: user.c:27:5: warning: implicit declaration of function ‘cmmdc’ [-Wimplicit-function-declaration] if(cmmdc(x,y)!=1) ^ user.c:30:22: warning: implicit declaration of function ‘fprint’ [-Wimplicit-function-declaration] fprint(o,"0"); ^ user.c:21:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.c:22:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&y); ^ /tmp/ccWAKZ0a.o: In function `main': user.c:(.text.startup+0x76): undefined reference to `cmmdc' user.c:(.text.startup+0xca): undefined reference to `fprint' collect2: error: ld returned 1 exit status