Difference between revisions of "Week 2"
(Created page with '<u>Reviewing IPC 144</u> The Question Mark Operator c = a > b ? 100 : 200; It replaces an if statement and is much faster. If a is greater than b then 100, else 200. Pleas…') |
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The Question Mark Operator | The Question Mark Operator | ||
| + | ''c = a > b ? 100 : 200;'' | ||
| − | + | It replaces an if statement and is much faster. If a is greater than b then 100, else 200. | |
| + | '''Please note: The types 100 and 200 must be the same type or else it will not work.''' | ||
| − | + | <u>Function Calls</u> | |
| + | ''printf("%d %d, b, b = b + 1);'' | ||
| − | + | It returns 21 21. Why? Some compilers stack the arguments and read the last argument first. Therefore, it would see b as 21 as well. | |
| + | ''a = printf("%d %d, b, b = b + 1); | ||
| − | + | printf("%d\n", a);'' | |
| + | |||
| + | What is a? | ||
| − | + | 6 | |
| − | + | printf returns the number of characters printed (scanf also returns the number of characters input - special note: scanf cannot return a number greater than the % symbols in your scanf statement). | |
Revision as of 12:33, 19 May 2010
Reviewing IPC 144
The Question Mark Operator
c = a > b ? 100 : 200;
It replaces an if statement and is much faster. If a is greater than b then 100, else 200.
Please note: The types 100 and 200 must be the same type or else it will not work.
Function Calls
printf("%d %d, b, b = b + 1);
It returns 21 21. Why? Some compilers stack the arguments and read the last argument first. Therefore, it would see b as 21 as well.
a = printf("%d %d, b, b = b + 1);
printf("%d\n", a);
What is a?
6
printf returns the number of characters printed (scanf also returns the number of characters input - special note: scanf cannot return a number greater than the % symbols in your scanf statement).
