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Topics

https://github.com/ucsb-cs16-s18-mirza/cs16-s18-lectures/tree/master/lec-07

Under the hood of program compilation and execution

• From high-level programs to machine code
  • What are .h, .o and .cpp file?
  • What is an execuatble
  • Steps in compilation * Creating object files and linking programs with g++
• Separate compilation with Makefiles read about Makefile
• Compile-time errors
• Linker errors

• Header guards

• Automate the compilation of code from lecture 5 using makefiles

Data and number representation

• Positional encoding: binary, hex, decimal
• Internal vs. external representation
• Conversion between different representations
• Key ideas: bits can represent ANYTHING. With n bits we can represent at most 2^N things
• Apply above rule to represent characters (ASCII), unicode, colors ….
• The data type of a variable determines its representation in memory AND the number of bits used to store each variable