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-rw-r--r--double-error.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/double-error.c b/double-error.c
index aaaa405..4cd1406 100644
--- a/double-error.c
+++ b/double-error.c
@@ -37,6 +37,21 @@ double_error difference(double_error de1, double_error de2){
bool is_greater(double_error de1, double_error de2){ return (de1.d > de2.d); }
+double_error maximum(double_error de1, double_error de2){
+ double_error de;
+ double max1 = de1.d+de1.e;
+ double max2 = de2.d+de2.e;
+ if( max1 >= max2 ){
+ de.d = de1.d;
+ de.e = de1.e + max1*EPS;
+ } else {
+ de.d = de2.d;
+ de.e = de2.e + max2*EPS;
+ }
+
+ return de;
+}
+
double_error product(double_error de1, double_error de2){
double_error de;
de.d = de1.d * de2.d;