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Hello World in C, then some variations (experiments) as I learn, initially re conditional statements.

The book I'm working from (for the moment) is Red Hat Linux 6 Unleashed; David Pitts, Bill Ball, et. al.; Sams; 1st Printing, 1999; ISBN 0-672-31689-7.

For my own information, I have my test C programs stored under directory ~/test_C on system5 -- maybe someday I should upload them here.



Hello World

In file hello.c:

printf("Hello, World\n");

To compile and run:

#gcc hello.c # ./a.out

Testing the Leap Year Conditional Expression

Modified to test an expression intended to test for leap years:

printf("Hello, World\n");
int year;

Evaluating the Leap Year Conditional

Double check the parenthesis count -- copied and pasted without testing.

This does not consider whatever it's called -- "short circuit evaluation" (or even left to right, it just consists of "snapshots" of how I (a person) might think of the sequence of evaluation -- it's useful to recognize the generalities of what happens, but, AFAIK, most computers / compilers would evaluate the expression left to right, and, IIRC, C will do a short circuit evaluation which means once one side of the or evaluates to true (non zero), the other side of the or is not evaluated.

Remember that zero = false, non-zero = true in C. Do I need to remember that, or is that just "the truth" about Boolean algebra?

Assume year=1960:


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  • () RandyKramer - 02 Apr 2003
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