Compilare: user.cpp: In function ‘int main()’: user.cpp:55:15: warning: unused variable ‘z’ [-Wunused-variable] int i, j, z, k; ^ user.cpp:55:18: warning: unused variable ‘k’ [-Wunused-variable] int i, j, z, k; ^ user.cpp: In function ‘int cod(char)’: user.cpp:18:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘bool cmp2(eu, eu)’: user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:59:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &N, &M); ^ user.cpp:61:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s\n", pent[i].sir); ^ user.cpp:74:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", s); ^