added new operators

src/bigint.cpp

@@ -7,6 +7,7 @@
 
 #include "bigint.h"
 #include <limits>
+#include <cstring>
 
 // constructors
 BigInt::BigInt() {

src/bigint.h

@@ -54,7 +54,6 @@ public:
     BigInt& operator = (const BigInt& val);
     BigInt& operator = (const std::string &imput);
     BigInt& operator = (long val);
-//    BigInt& operator = (const BigInt& val);
 
     friend BigInt operator + ( BigInt left, const BigInt& right);
     friend BigInt operator + ( BigInt left, const std::string &right);
@@ -77,7 +76,6 @@ public:
     friend BigInt operator-(BigInt val);
 
     friend BigInt& operator -= ( BigInt &left, long right);
-//    friend BigInt& operator -= ( long left, BigInt & right);
 
     friend BigInt& operator -= ( BigInt &left, const BigInt& right);
     friend BigInt& operator -= ( BigInt &left, const std::string &right);

tests/tst_arithmetictests.cpp

@@ -756,6 +756,7 @@ void arithmetictests::testOperators() {
     QVERIFY(num1.sizeBytes() == sizeof (long));
     QVERIFY(num1.sizeType() == sizeof (long) * 2);
 
+
 }