Compilare: user.c: In function ‘primes’: user.c:7:2: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(p,0,n+1); ^ user.c:7:2: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c: In function ‘main’: user.c:28:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&n); ^ user.c: In function ‘primes’: user.c:7:8: warning: ‘p’ is used uninitialized in this function [-Wuninitialized] memset(p,0,n+1); ^