Compilare: main.cpp: In function 'int main()': main.cpp:8:15: warning: variable 'out' set but not used [-Wunused-but-set-variable] FILE *in,*out; ^~~ main.cpp:11:13: warning: variable 'nr' set but not used [-Wunused-but-set-variable] int n,i,nr; ^~ main.cpp:13:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ main.cpp:16:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,132,in); ^