1 files changed, 28 insertions, 0 deletions
diff --git a/src/number.c b/src/number.c
index 5d4cd18..e63427f 100644
--- a/src/number.c
+++ b/src/number.c
@@ -18,6 +18,10 @@ limitations under the License.
 #include <stdlib.h>
 #include <stdio.h>
 #include <math.h>
+#include <stdarg.h>
+// define MPFR_USE_VA_LIST to enable the use of mpfr_inits and mpfr_clears
+#define MPFR_USE_VA_LIST
+#include <mpfr.h>
 #include "istring.h"
 #include "definitions.cpp"
 #include "tools.h"
@@ -358,6 +362,30 @@ long double number_double_val(Number x){
   }
   return(ret);
 }
+// approximate numerical expression (as mpfr float)
+int number_mpfr_val(mpfr_t out, Number x){
+  int i;
+  // auxiliary variables (do not initialize A)
+  mpfr_t A,b,c;
+  mpfr_inits(b,c, (mpfr_ptr)NULL);
+
+  mpfr_init(out);
+  mpfr_set_zero(out,1);
+
+  for(i=0;i<x.length;i++){
+    if(x.scalars[i].numerator!=0){
+      mpfr_sqrt_ui(b, x.base[i], MPFR_RNDN);
+      Q_mpfr_value(A, x.scalars[i]);
+      mpfr_mul(c, A, b, MPFR_RNDN);
+      mpfr_add(b, out, c, MPFR_RNDN);
+      mpfr_set(out, b, MPFR_RNDN);
+    }
+  }
+
+  mpfr_clears(A,b,c, (mpfr_ptr)NULL);
+
+  return(0);
+}
 
 
 // print to string