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authorkaernyk <kaernyk@users.noreply.github.com>2014-09-09 22:12:46 -0400
committerkaernyk <kaernyk@users.noreply.github.com>2014-09-09 22:12:46 -0400
commit48d022b54d57b246e9923cda5ac8dfb07b0235d1 (patch)
tree13fc24f1ddf852842aec31526d035f012bcfcb7c /c.html.markdown
parentb492bf6f379d9b8ff9d29872b970f2c0f7e5fa41 (diff)
parentfb4b12c567c37144bd107f286b5858267a43eb8a (diff)
Merge pull request #2 from kaernyk/master
Update repo
Diffstat (limited to 'c.html.markdown')
-rw-r--r--c.html.markdown12
1 files changed, 9 insertions, 3 deletions
diff --git a/c.html.markdown b/c.html.markdown
index 79b7aec7..cbb6d289 100644
--- a/c.html.markdown
+++ b/c.html.markdown
@@ -4,6 +4,7 @@ filename: learnc.c
contributors:
- ["Adam Bard", "http://adambard.com/"]
- ["Árpád Goretity", "http://twitter.com/H2CO3_iOS"]
+ - ["Jakub Trzebiatowski", "http://cbs.stgn.pl"]
---
@@ -175,6 +176,9 @@ int main() {
i2 * i1; // => 2
i1 / i2; // => 0 (0.5, but truncated towards 0)
+ // You need to cast at least one integer to float to get a floating-point result
+ (float)i1 / i2 // => 0.5f
+ i1 / (double)i2 // => 0.5 // Same with double
f1 / f2; // => 0.5, plus or minus epsilon
// Floating-point numbers and calculations are not exact
@@ -194,9 +198,11 @@ int main() {
2 >= 2; // => 1
// C is not Python - comparisons don't chain.
- // WRONG:
- //int between_0_and_2 = 0 < a < 2;
- // Correct:
+ // Warning: The line below will compile, but it means `(0 < a) < 2`.
+ // This expression is always true, because (0 < a) could be either 1 or 0.
+ // In this case it's 1, because (0 < 1).
+ int between_0_and_2 = 0 < a < 2;
+ // Instead use:
int between_0_and_2 = 0 < a && a < 2;
// Logic works on ints