Compilare: user.c: In function ‘main’: user.c:35:4: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration] if(citire==0) exit(1); ^ user.c:35:18: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] if(citire==0) exit(1); ^ user.c:76:16: warning: ‘lungime’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=0;i<s/lungime;i++) ^