1 files changed, 10 insertions, 5 deletions

diff --git a/sum3.awk b/sum3.awk
index 3e4661f..7f11a49 100644
--- a/sum3.awk
+++ b/sum3.awk
@@ -11,24 +11,29 @@ function isnum(n) {
 }
 
 
-BEGIN { OFS = FS }
+BEGIN {
+    OFS = FS
+}
+
 
 NR == 1 {
-    nfld = NF
     for (i=1; i<=NF; i++)
         numcol[i] = isnum($i)
 }
 
-{
+
+NF > 0 {
+    (NF > nf_max) ? nf_max = NF : nf_max = nf_max
     for (i=1; i<=NF; i++)
         if (numcol[i])
             sum[i] += $i
 }
 
+
 END {
-    for (i=1; i<=nfld; i++) {
+    for (i=1; i<=nf_max; i++) {
         printf(numcol[i] ? sum[i] : "--")
-        printf(i < nfld ? OFS : ORS)
+        printf(i < nf_max ? OFS : ORS)
     }
 }