Compilare: user.cpp: In function ‘int main()’: user.cpp:24:33: warning: left operand of comma operator has no effect [-Wunused-value] complex<double> A(a,b),B=(c,d),C(e,f); ^ user.cpp:22:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d%d%d%d%d",&a,&b,&c,&d,&e,&f); ^