rename repo, subdir for yearly challenges

2020/day02/ex2-c.c

@@ -0,0 +1,24 @@
+/* ex2-c: Advent2020 game, day 2/game 2
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int ccount(char *str, char c, int pos1, int pos2)
+{
+     return ((str[pos1-1] == c) + (str[pos2-1] == c)) == 1;
+}
+
+int main(ac, av)
+char **av;
+{
+     int beg, end, nc, found=0, nlines=0;
+     char c, str[80];
+
+     while (scanf("%d-%d %c: %s", &beg, &end, &c, str) != EOF) {
+          found += ccount(str, c, beg, end);
+          nlines++;
+     }
+     printf ("%s : lines: %d matched:%d\n", *av, nlines, found);
+     exit (0);
+}