round: ignore empty lines

diff --git a/math/round.c b/math/round.c
index e422fd0..f87d3c1 100644 (file)
--- a/math/round.c
+++ b/math/round.c
@@ -6,6 +6,8 @@ int main(int argc, char **argv) {
   double target = strtod(argv[1], NULL);
   char line[128];
   while (fgets(line, sizeof(line), stdin)) {
+    trim_end(line, "\r\n \t");
+    if (!*line) continue;
     double n = strtod(line, NULL);
     double quot = n / target;
     quot = round(quot);