Compilare: user.cpp: In function ‘int main()’: user.cpp:10:20: warning: unused variable ‘p’ [-Wunused-variable] double a,b,x,y,p,q,dist,xf,yf,alfa=1; ^ user.cpp:10:22: warning: unused variable ‘q’ [-Wunused-variable] double a,b,x,y,p,q,dist,xf,yf,alfa=1; ^ user.cpp:6:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.in","r",stdin); ^ user.cpp:7:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.out","w",stdout); ^ user.cpp:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:16:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf",&a,&b,&x,&y); ^