X-Git-Url: http://git.thejh.net/?p=tools.git;a=blobdiff_plain;f=math%2Fround.c;fp=math%2Fround.c;h=e422fd0ce216147856f5ed2ddc3ee4871e1f85c2;hp=0000000000000000000000000000000000000000;hb=7ebc44a8d838298394178687975cf9d2994ff8be;hpb=86973028b439986f4b2a7722c92e44c643ff5869

diff --git a/math/round.c b/math/round.c
new file mode 100644
index 0000000..e422fd0
--- /dev/null
+++ b/math/round.c
@@ -0,0 +1,16 @@
+#include <jh.h>
+#include <math.h>
+
+int main(int argc, char **argv) {
+  if (argc != 2) xperror("invocation: round <target>", 0);
+  double target = strtod(argv[1], NULL);
+  char line[128];
+  while (fgets(line, sizeof(line), stdin)) {
+    double n = strtod(line, NULL);
+    double quot = n / target;
+    quot = round(quot);
+    n = quot * target;
+    printf("%f\n", n);
+  }
+  return 0;
+}