Compilare: user.cpp: In function ‘int mult_mat()’: user.cpp:12:9: warning: unused variable ‘i1’ [-Wunused-variable] int i1,j1,i,j,k; ^~ user.cpp:12:12: warning: unused variable ‘j1’ [-Wunused-variable] int i1,j1,i,j,k; ^~ user.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int inmult()’: user.cpp:45:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:49:19: warning: unused variable ‘i1’ [-Wunused-variable] long long i,j,i1,j1; ^~ user.cpp:49:22: warning: unused variable ‘j1’ [-Wunused-variable] long long i,j,i1,j1; ^~