Compilare: main.cpp: In function 'bool cmp(line, line)': main.cpp:37:12: warning: unused variable 'f1' [-Wunused-variable] double f1=(-1.0*a.a)/a.b; ^~ main.cpp:38:12: warning: unused variable 'f2' [-Wunused-variable] double f2=(-1.0*b.a)/b.b; ^~ main.cpp: In function 'bool cmp2(line, line)': main.cpp:46:12: warning: unused variable 'f1' [-Wunused-variable] double f1=(-1.0*a.b)/a.a; ^~ main.cpp:47:12: warning: unused variable 'f2' [-Wunused-variable] double f2=(-1.0*b.b)/b.a; ^~ main.cpp: In function 'void read(int&)': main.cpp:70:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ main.cpp:80:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ main.cpp: In function 'int main()': main.cpp:88:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drepte3.in","r",stdin); ^ main.cpp:89:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drepte3.out","w",stdout); ^ main.cpp:90:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^