format for % was wrong

diff --git a/util/cpp/ch7bin.c b/util/cpp/ch7bin.c
index 2400567..189ab61 100644 (file)
--- a/util/cpp/ch7bin.c
+++ b/util/cpp/ch7bin.c
@@ -15,7 +15,7 @@ ch7bin(pval, oper, val)
        switch (oper)   {
        case '%':
                if (val == 0)
-                       error("% by 0");
+                       error("%% by 0");
                else
                        *pval = *pval % val;
                break;