diff --git a/src/addition.c b/src/addition.c
index 6b17097..5dcd167 100644
--- a/src/addition.c
+++ b/src/addition.c
@@ -77,7 +77,7 @@ unsigned int addition_precision_float(unsigned int p1, unsigned int p2) {
     return addition_uint(p1, p2);
 }
 
-// writing number out of sign, exponent and precision
+// writing floating number out of sign, exponent and precision
 
 unsigned int output_float(unsigned int sign, unsigned int exponent, unsigned int precision) {
     return (sign << 31) | (exponent << 23) | precision;
@@ -129,4 +129,10 @@ unsigned long long precision_double(unsigned long long a) {
 unsigned long long exponent_double(unsigned long long number) {
     unsigned long long exponent = 0x7ff0000000000000;
     return (number & exponent) >> 52;
+}
+
+// writing double number out of sign, exponent and precision
+
+unsigned long long output_double(unsigned long long sign, unsigned long long exponent, unsigned long long precision) {
+    return (sign << 63) | (exponent << 52) | precision;
 }
\ No newline at end of file
diff --git a/src/addition.h b/src/addition.h
index 20a8068..0ed5aec 100644
--- a/src/addition.h
+++ b/src/addition.h
@@ -29,4 +29,6 @@ unsigned long long precision_double(unsigned long long a);
 
 unsigned long long exponent_double(unsigned long long number);
 
+unsigned long long output_double(unsigned long long sign, unsigned long long exponent, unsigned long long precision);
+
 #endif // ADDITION_H
\ No newline at end of file