DAY13
Monday, 11 June 2012

Today we will talk about:

• the if statement for making decisions;
• the if/else and if/elseif/else statements;
• nested or double if statements;
• the logical AND, OR, and NOT operators;
• Boolean variables;

Note: the "switch" statement is not a very important part of C. It's complicated and tricky and easy to use incorrectly. We will go over it, but you should concentrate on the if/then/else and boolean information.

Note #2: the "conditional operator" or "question mark operator" is a horrible piece of C, and I won't talk about it, and it won't appear on any lab, homework, or exam.

Programs and functions we might talk about:

• guess_again.c, guess the program's secret number.
• min1.c, determines the minimum of A and B using an if.
• min2.c, determines the minimum of A and B using if/else.
• min3.c, determines the minimum of A, B, C using two if's.
• min4.c, determines the minimum of A, B, C using if/elseif/else.
• month_length.c, prints the number of days in a month (ignoring leap year).
• next_date.c, determines the day after M/D/Y.
• next_date2.c, determines the day after M/D/Y. Checks for leap year. Also uses boolean variables.
• p6.5.c, determines if Y is a leap year.
• p6.8a.c, evaluates simple expressions like 1+2, 3*4, 5/6, 7-8.