Compilare: user.c: In function 'inmul_matrix': user.c:24: warning: implicit declaration of function 'memcpy' user.c:24: warning: incompatible implicit declaration of built-in function 'memcpy' user.c: In function 'main': user.c:119: warning: format '%d' expects type 'int', but argument 2 has type 'long int' user.c:120: warning: format '%d' expects type 'int', but argument 3 has type 'long int' user.c:64: warning: unused variable 'k' user.c:124: warning: control reaches end of non-void function