Compilare: user.cpp: In function ‘void printKeys(char*)’: user.cpp:31:9: warning: unused variable ‘length’ [-Wunused-variable] int length = strlen(param); ^ user.cpp: In function ‘void printValues(char*)’: user.cpp:49:9: warning: unused variable ‘length’ [-Wunused-variable] int length = strlen(param); ^ user.cpp: In function ‘int main()’: user.cpp:81:37: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buffer,DIM_BUFFER,fin); ^ user.cpp:97:37: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buffer,DIM_BUFFER,fin); ^