skydoor questions

• what's on the stack when a function is called?
• One question about vector push_back
• How to convert the time to a c string in c?
• sort() function in C++
• design a circle in the 3-D space
• How can I sort the vector elements using members as the key in C++
• How to group the records according to the range in SQL
• why are concrete types rarely useful as bases for further derivation
• How to get the printed information of a command in Shell Script
• The method used in 3rd-party garbage collector

skydoor answers