Compilare: user.cpp: In function ‘int main()’: user.cpp:43:17: warning: unused variable ‘q’ [-Wunused-variable] int i,j,z=0,q,w; ^ user.cpp:43:19: warning: unused variable ‘w’ [-Wunused-variable] int i,j,z=0,q,w; ^ user.cpp:46:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&p,&n,&m,&k); ^ user.cpp:49:60: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] z++,in[z].x=i,in[z].y=j,fscanf(f,"%d",&in[z].v); ^