DAY14
Wednesday, 13 June 2012

Today we will talk about:

• boolean expressions, including AND and OR;
• examples of working with dates and leap years;
• the switch statement for selecting a group of statements to execute based on a key value;

Programs and functions we might talk about:

• calendar_2012.png, a calendar for 2012.
• month_length.c, prints the number of days in a month (ignoring leap year), using if/elseif/else, a nested if statement, and a compound boolean expression.
• month_length_switch.c, prints the number of days in a month (ignoring leap year), using a switch statement. It also uses a nonzero return value for illegal year input (1) or illegal month input (2). If you run the program and give it illegal input, type "echo $?" to see that the error number was reported. This is why a C program has a return value!
• next_binary.c, a program which computes and prints the binary representation of integers from 00000 (0) to 11111 (31);
• next_date.c, determines the day after M/D/Y, using compound boolean expressions.
• 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, using if and else, and a compound boolean expression.
• p6.10a.c, a program which prints a table of prime numbers, using if statements and a boolean variable.