Sabrina questions

• Screen command disable the control key ctrl-a to use it in vim?
• Why there is no sign character in the syntax of constants?
• How can I display <TAB> as bars in vim
• lone declaration in if statement?
• Change the hold time of the cursor?
• character string literal and string literal in standard?
• Meaning of asterisk as index of array in function parameter? [duplicate]
• Valid preprocessor tokens in macro concatenation

Sabrina answers