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author | zlg <zlg@zlg.space> | 2013-04-06 05:41:28 -0500 |
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committer | zlg <zlg@zlg.space> | 2013-04-06 05:41:28 -0500 |
commit | 84f1c31fcf1a073e161ece6284272ff75ee0dcf2 (patch) | |
tree | e400597c0602c76929431285602b3e932eba3dac /ch2/2-10_lower.c | |
parent | Solve Exercise 2-9: bitcount() (diff) | |
download | knr-84f1c31fcf1a073e161ece6284272ff75ee0dcf2.tar.gz knr-84f1c31fcf1a073e161ece6284272ff75ee0dcf2.tar.bz2 knr-84f1c31fcf1a073e161ece6284272ff75ee0dcf2.tar.xz knr-84f1c31fcf1a073e161ece6284272ff75ee0dcf2.zip |
Solve Exercise 2-10: lower()
Also added more information to 2-09's comments.
Diffstat (limited to 'ch2/2-10_lower.c')
-rw-r--r-- | ch2/2-10_lower.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/ch2/2-10_lower.c b/ch2/2-10_lower.c new file mode 100644 index 0000000..fe0288b --- /dev/null +++ b/ch2/2-10_lower.c @@ -0,0 +1,20 @@ +#include <stdio.h> + +/* The C Programming Language: 2nd Edition + * + * Exercise 2-10: Rewrite the function 'lower', which converts upper case + * letters to lower case, with a conditional expression instead of if-else. + * + * Answer: The tertiary ?: operators also _evaluate_, so they can be used in + * a lot of different places. + */ + +int lower(int c) { + return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c; +} + +int main() { + char foo = 'F'; + printf("The follow letter should be lowercase: %c\n", lower(foo)); + return 0; +} |