Compilare: main.cpp: In function 'long long int intersect(int, int)': main.cpp:50:17: warning: unused variable 'b' [-Wunused-variable] long long a,b,c,dif; ^ main.cpp:50:19: warning: unused variable 'c' [-Wunused-variable] long long a,b,c,dif; ^ main.cpp:55:20: warning: variable 'sol' set but not used [-Wunused-but-set-variable] double A,B,C,D,sol; ^~~ main.cpp: In function 'int getint()': main.cpp:14:40: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ main.cpp:19:40: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^