Compilare: main.cpp: In function 'int main()': main.cpp:44:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp: In function 'int getop()': main.cpp:37:10: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] return nr; ^~