Compilare: user.cpp: In function ‘int main()’: user.cpp:16:15: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] delta=W^2-4*A*(H-A); ^ user.cpp:7:14: warning: unused variable ‘C’ [-Wunused-variable] float C1,C2,C,delta; ^ user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri.in","r",stdin); ^ user.cpp:9:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri.out","w",stdout); ^ user.cpp:10:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&M); ^