Compilare: user.cpp: In function ‘void read()’: user.cpp:39:84: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d%d%d%d", &nr_of_rows_columns, &K1, &K2, &r1, &c1, &r2, &c2); ^ user.cpp:42:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &IM[i][j]); ^ user.cpp: In function ‘int lee_zeros(int, int, int, int)’: user.cpp:97:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int lee_K1(int, int, int, int)’: user.cpp:145:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int lee_K2(int, int, int, int)’: user.cpp:193:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int lee_K1_K2(int, int, int, int)’: user.cpp:241:1: warning: control reaches end of non-void function [-Wreturn-type] } ^