R__ questions

• Minimal example to compile & run assembly with gcc?
• How to catch run time error in C and C++?
• How does gcc calculate the required space for a structure?
• I can print the memory with gdb's x command ,but if I use printf,segmentation fault
• In assembly, how do you deal with C struct?
• What's the int macro for stdin?
• How do you get file size by fd?
• What does cltq do in assembly?

R__ answers