C solutions for week 135

3 files changed, 133 insertions, 0 deletions

diff --git a/challenge-135/abigail/README.md b/challenge-135/abigail/README.md
index aa835b7f1e..6c58ec0530 100644
--- a/challenge-135/abigail/README.md
+++ b/challenge-135/abigail/README.md
@@ -2,8 +2,10 @@
 
 ## Part 1
 
+* [C](c/ch-1.c)
 * [Perl](perl/ch-1.pl)
 
 ## Part 2
 
+* [C](c/ch-2.c)
 * [Perl](perl/ch-2.pl)
diff --git a/challenge-135/abigail/c/ch-1.c b/challenge-135/abigail/c/ch-1.c
new file mode 100644
index 0000000000..13776746e5
--- /dev/null
+++ b/challenge-135/abigail/c/ch-1.c
@@ -0,0 +1,72 @@
+# include <stdlib.h>
+# include <stdio.h>
+# include <string.h>
+# include <ctype.h>
+# include <stdbool.h>
+
+/*
+ * See ../README.md
+ */
+
+/*
+ * Run as: cc -o ch-1.o ch-1.c; ./ch-1.o < input-file
+ */
+
+int main (void) {
+    char *  line    = NULL;
+    size_t  len     = 0;
+    size_t  str_len;
+
+    while ((str_len = getline (&line, &len, stdin)) != -1) {
+        char * line_ptr = line;
+        bool done = false;
+        if (* line_ptr == '-' || * line_ptr == '+') {
+            str_len --;
+            line_ptr ++;
+            while (isspace (* line_ptr)) {
+                line_ptr ++;
+                str_len --;
+            }
+        }
+        /*
+         * Is it an integer?
+         */
+        char * line_ptr2 = line_ptr;
+        while (* line_ptr2 && * line_ptr2 != '\n') {
+            if (!isdigit (* line_ptr2)) {
+                printf ("not an integer\n");
+                done = true;
+                break;
+            }
+            line_ptr2 ++;
+        }
+        if (done) {
+            continue;
+        }
+
+        /*
+         * Is the length odd? (Note the string itself still contains a newline)
+         */
+        if (str_len % 2 == 1) {
+            printf ("even number of digits\n");
+            continue;
+        }
+
+        /*
+         * Long enough?
+         */
+        if (str_len < 4) {
+            printf ("too short\n");
+            continue;
+        }
+
+        size_t mid = (str_len - 3) / 2;
+        for (size_t i = 0; i < 3; i ++) {
+            printf ("%c", line_ptr [mid + i]);
+        }
+        printf ("\n");
+    }
+    free (line);
+
+    return (0);
+}
diff --git a/challenge-135/abigail/c/ch-2.c b/challenge-135/abigail/c/ch-2.c
new file mode 100644
index 0000000000..ba49db177e
--- /dev/null
+++ b/challenge-135/abigail/c/ch-2.c
@@ -0,0 +1,59 @@
+# include <stdlib.h>
+# include <stdio.h>
+# include <string.h>
+
+/*
+ * See ../README.md
+ */
+
+/*
+ * Run as: cc -o ch-2.o ch-2.c; ./ch-2.o < input-file
+ */
+
+short w [] = {1, 3, 1, 7, 3, 9, 1};
+
+int main (void) {
+    char *  line    = NULL;
+    size_t  len     = 0;
+    size_t  str_len;
+
+    while ((str_len = getline (&line, &len, stdin)) != -1) {
+        char * line_ptr = line;
+        short valid = 1;
+        if (str_len == 8) {
+            int check = 0;
+            for (size_t i = 0; i < 7 && valid; i ++) {
+                char first;
+                int  base;
+                if ('0' <= line_ptr [i] && line_ptr [i] <= '9') {
+                    first = '0';
+                    base  =  0;
+                }
+                else {
+                    if ('B' <= line_ptr [i] && line_ptr [i] <= 'Z' &&
+                               line_ptr [i] != 'E'                 &&
+                               line_ptr [i] != 'I'                 &&
+                               line_ptr [i] != 'O'                 &&
+                               line_ptr [i] != 'U') {
+                        first = 'A';
+                        base  = 10;
+                    }
+                    else {
+                        valid = 0;
+                    }
+                }
+                check += (line_ptr [i] - first + base) * w [i];
+            }
+            if (check % 10 != 0) {
+                valid = 0;
+            }
+        }
+        else {
+            valid = 0;
+        }
+        printf ("%d\n", valid);
+    }
+    free (line);
+
+    return (0);
+}