C solution for week 97. part 2

2 files changed, 53 insertions, 0 deletions

diff --git a/challenge-097/abigail/README.md b/challenge-097/abigail/README.md
index e5b520217a..10240df509 100644
--- a/challenge-097/abigail/README.md
+++ b/challenge-097/abigail/README.md
@@ -67,6 +67,7 @@ Binary Substrings:
 
 ### Solutions
 * [AWK](awk/ch-2.awk)
+* [C](c/ch-2.c)
 * [Perl](perl/ch-2.pl)
 
 ### Blog
diff --git a/challenge-097/abigail/c/ch-2.c b/challenge-097/abigail/c/ch-2.c
new file mode 100644
index 0000000000..dd1441f6a4
--- /dev/null
+++ b/challenge-097/abigail/c/ch-2.c
@@ -0,0 +1,52 @@
+# include <stdlib.h>
+# include <stdio.h>
+# include <string.h>
+# include <unistd.h>
+# include <ctype.h>
+
+/*
+ * See ../README.md
+ */
+
+/*
+ * Run as: cc -o ch-2.o ch-2.c; ./ch-2.o -s SECTIONS < input-file
+ */
+
+int main (int argc, char ** argv) {
+    char *  line     = NULL;
+    size_t  len      = 0;
+    size_t  strlen;
+    int     ch;
+    int     sections = -1;
+
+    while ((ch = getopt (argc, argv, "s:")) != -1) {
+        switch (ch) {
+            case 's':
+                sections = atoi (optarg);
+                break;
+        }
+    }
+    if (sections < 0) {
+        fprintf (stderr, "Requires an -s SECTIONS parameter\n");
+        exit (1);
+    }
+
+    while ((strlen = getline (&line, &len, stdin)) != -1) {
+        strlen --;                    /* We don't care about the newline */
+        int len = strlen / sections;  /* Section length                  */
+        int sum = 0;
+        for (int i = 0; i < len; i ++) {
+            int zeros = 0;
+            for (int j = 0; j < sections; j ++) {
+                if (line [j * len + i] == '0') {
+                    zeros ++;
+                }
+            }
+            int ones = sections - zeros;
+            sum += zeros < ones ? zeros : ones;
+        }
+        printf ("%d\n", sum);
+    }
+    free (line);
+    return (0);
+}