Merge pull request #48 from yashsoni501/main

Added >, <, <=, >= operators along with tests

big-int/src/operators/equal_to.cpp

@@ -71,7 +71,7 @@ bool largeInt::operator==(int z)
         {
             return false;
         }
-        std:: cout << z << std::endl;
+
         z /= 10;
         n--;
     }

big-int/src/operators/greater_equal.cpp

@@ -32,5 +32,25 @@
 
 namespace libbig
 {
-
-} // namespace libbig
+  /**
+   * @brief greater equal operator overload for largeInt class.
+   *
+   * @param right hand parameter of >= operator
+   * @return true if *this (object on which this function is
+   *         called upon) is greater or equal else
+   *         false
+   *
+   */
+  bool largeInt::operator>=(const largeInt &a)
+  {
+    /**
+     * if both > and == conditions are satisfied then >= condition 
+     * is satified too
+     */
+    if(*this>a || *this==a)
+    {
+      return true;
+    }
+    return false;
+  }
+} // namespace libbig

big-int/src/operators/greater_than.cpp

@@ -32,5 +32,77 @@
 
 namespace libbig
 {
+  /**
+   * This operator returns a bool value which is 
+   * 1 when the > condition is satisfied between the two largeInt object
+   * 0 otherwise
+   */
+  bool largeInt::operator>(const largeInt &a)
+  {
+    /**
+     * If first number is negative and second number is positive
+     * then > condition is not satisfied.
+     *
+     */
+    if(this->sign == NEGATIVE && a.sign == POSITIVE)
+    {
+      return false;
+    }
 
-} // namespace libbig
+    /** 
+     * If first number is positive and second number is negative
+     * then > condition is satisfied.
+     *
+     */
+    if(a.sign == NEGATIVE && this->sign == POSITIVE)
+    {
+      return true;
+    }
+
+    /** 
+     * If both the numbers have same sign
+     * then comparing their lengths.
+     *
+     */
+    if(this->number.length() > a.number.length())
+    {
+      /**
+       * if first number is longer and both are negative then
+       * the condition is satisfied, but if first number is 
+       * longer and both are positive then the condition is not 
+       * satisfied.
+       */
+      return 0^this->sign;
+    }
+    if(this->number.length() < a.number.length())
+    {
+      /**
+       * if first number is shorter and both are negative then
+       * the condition is not satisfied, but if first number is
+       * shorter and both are positive then the condition is
+       * satisfied.
+       *
+       */
+      return 1^this->sign;
+    }
+
+    /** 
+     * if the length of both numbers are same then we compare each
+     * digit from LTR and the first non equal digit can determine 
+     * whether the condition is satisfied
+     *
+     */
+    for(int i=0;i<a.number.length();i++)
+    {
+      if(this->number[i]>a.number[i])
+      {
+        return !(1^this->sign);
+      }
+      if(this->number[i]<a.number[i])
+      {
+        return !(0^this->sign);
+      }
+    }
+    return false;
+  }
+} // namespace libbig

big-int/src/operators/less_equal.cpp

@@ -32,5 +32,23 @@
 
 namespace libbig
 {
-
-} // namespace libbig
+  /**
+   * This operator returns a bool value which is
+   * 1 when the <= condition is satisfied between the two largeInt objects
+   * 0 otherwise
+   *
+   */
+  bool largeInt::operator<=(const largeInt &a)
+  {
+    /**
+     * if both < and == conditions are satisfied then <= condition is
+     * satified too
+     *
+     */
+    if(*this<a || *this==a) 
+    {
+      return true;
+    }
+    return false;
+  }
+} // namespace libbig

big-int/src/operators/less_than.cpp

@@ -32,5 +32,77 @@
 
 namespace libbig
 {
+  /**
+   * This operator returns a bool value which is
+   * 1 when the < condition is satisfied between the two largeInt objects
+   * 0 otherwise
+   *
+   */
+  bool largeInt::operator<(const largeInt &a)
+  {
+    /**
+     * If first number is negative and second number is positive
+     * then < condition is satisfied.
+     *
+     */
+    if(this->sign == NEGATIVE && a.sign == POSITIVE)
+    {
+      return true;
+    }
 
+    /**
+     * If first number is positive and second number is negative
+     * then < condition is not satisfied.
+     *
+     */
+    if(a.sign == NEGATIVE && this->sign == POSITIVE)
+    {
+      return false;
+    }
+
+    /**
+     * If both the numbers have same sign
+     * then comparing their lengths
+     *
+     */
+    if(this->number.length() > a.number.length())
+    {
+      /** 
+       * if first number is longer and both are negative then the
+       * condition is not satisfied, but if first number is longer
+       * and both are positive then the condition is satisfied.
+       *
+       */
+      return 1^this->sign;
+    }
+    if(this->number.length() < a.number.length())
+    {
+      /**
+       * if first number is shorter and both are negative then the
+       * condition is satisfied, but if first number is shorter and
+       * both are positive then the condition is not satisfied.
+       *
+       */
+      return 0^this->sign;
+    }
+
+    /**
+     * if the length of both numbers are same then we compare each digit
+     * from LTR and the first non equal digit can determine whether the
+     * condition is satisfied
+     *
+     */
+    for(int i=0;i<a.number.length();i++)
+    {
+      if(this->number[i]<a.number[i])
+      {
+        return !(1^this->sign);
+      }
+      if(this->number[i]>a.number[i])
+      {
+        return !(0^this->sign);
+      }
+    }
+    return false;
+  }
 } // namespace libbig

tests/operators/greater_equal_test.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+#include<cassert>
+#include<random>
+#include<bigint.hpp>
+
+int main()
+{  
+    libbig::largeInt a,b;
+
+    std::random_device rd; // obtain a random number from hardware
+    std::mt19937 gen(rd()); // seed the generator
+    std::uniform_int_distribution<> distr(-2147483648, 2147483647); // define the range
+
+    for(int i=0;i<100;i++)
+    {
+        int i1 = distr(gen);
+        int i2 = distr(gen);
+        a = i1;
+        b = i2;
+        assert((a>=b) == (i1>=i2));
+    }
+}

tests/operators/greater_than_test.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+#include<cassert>
+#include<random>
+#include<bigint.hpp>
+
+int main()
+{  
+    libbig::largeInt a,b;
+
+    std::random_device rd; // obtain a random number from hardware
+    std::mt19937 gen(rd()); // seed the generator
+    std::uniform_int_distribution<> distr(-2147483648, 2147483647); // define the range
+
+    for(int i=0;i<100;i++)
+    {
+        int i1 = distr(gen);
+        int i2 = distr(gen);
+        a = i1;
+        b = i2;
+        assert((a>b) == (i1>i2));
+    }
+}

tests/operators/less_equal_test.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+#include<cassert>
+#include<random>
+#include<bigint.hpp>
+
+int main()
+{  
+    libbig::largeInt a,b;
+
+    std::random_device rd; // obtain a random number from hardware
+    std::mt19937 gen(rd()); // seed the generator
+    std::uniform_int_distribution<> distr(-2147483648, 2147483647); // define the range
+
+    for(int i=0;i<100;i++)
+    {
+        int i1 = distr(gen);
+        int i2 = distr(gen);
+        a = i1;
+        b = i2;
+        assert((a<=b) == (i1<=i2));
+    }
+}

tests/operators/less_than_test.cpp

@@ -0,0 +1,22 @@
+#include<iostream>
+#include<cassert>
+#include<random>
+#include<bigint.hpp>
+
+int main()
+{  
+    libbig::largeInt a,b;
+
+    std::random_device rd; // obtain a random number from hardware
+    std::mt19937 gen(rd()); // seed the generator
+    std::uniform_int_distribution<> distr(-2147483648, 2147483647); // define the range
+
+    for(int i=0;i<100;i++)
+    {
+        int i1 = distr(gen);
+        int i2 = distr(gen);
+        a = i1;
+        b = i2;
+        assert((a<b) == (i1<i2));
+    }
+}