Intro to Programming Teaching Assistant --- week3

Agenda

Converting between different number systems
Writing simple c codes
Using the less obvious features of printf(like width field and precision)

Notes

• Why is the exponent in ieee format stored as an unsigned int instead of in 2’s complement.

  • Reason

    Read this and this and this

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• Valid variable names

  • Had n’t known that just an _ was a valid variable name in C
  • Read this C variable naming rules - C Programming - c4learn.com

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• Evaluating expressions in printf

  • Read this Evaluation of Expressions inside printf in C - Stack Overflow

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• Using width field, precision in printf

  The value of the field width or precision can be specified as a separate parameter like so:

   printf("%*d*", 3, my_var)
  

  Here 3 represents the value of the width field

  • Read this

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• Having to link math.h while compiling

  Even after specifying math.h as #include, the way to make the code work properly is to do this:

   $ gcc my_file.c -lm
  

  • Reason

    Read this