C++ Tutorial Index

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C++ Control Statements

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C++ Functions

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C++ Arrays

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C++ Strings

C++ Strings

C++ Inheritance

C++ Inheritance Single level Inheritance Multilevel Inheritance Multiple Inheritance Hierarchical Inheritance Hybrid Inheritance

C++ Polymorphism

C++ Polymorphism C++ Overloading C++ Overriding C++ Virtual Function

C++ Pointers

C++ Pointers C++ this pointer

C++ Exception Handling

C++ Exception Handling

C++ Constructors

C++ Constructors Default Constructor Parameterize Constructor Copy constructor Constructor Overloading Destructor

C++ File Handling

C++ File Handling C++ Writing to file C++ Reading file C++ Close file

Miscellaneous

C Vs C++ C++ Comments C++ Data Abstraction C++ Identifier C++ Memory Management C++ Storage Classes C++ Void Pointer C++ Array To Function C++ Expressions C++ Features C++ Interfaces C++ Encapsulation std::min in C++ External merge sort in C++ Remove duplicates from sorted array in C++ Precision of floating point numbers Using these functions floor(), ceil(), trunc(), round() and setprecision() in C++ C++ References C++ Friend Functions C++ Mutable keyword Unary Operators in C++ Initialize Array of objects with parameterized constructors in C++ Differences between #define & const in C/C++ C++ Program to Implement Shell Sort C++ Program to Implement Merge Sort Storage Classes in C Vector resize() in C++ Passing by Reference Vs. Passing by the pointer in C++ Free vs delete() in C++ goto statement in C and C++ C++ program to read string using cin.getline() C++ String Concatenation Heap Sort in C++ Swap numbers in C++ Input Iterators in C++ Fibonacci Series in C++ C ++ Program: Alphabet Triangle and Number Triangle C++ Program: Matrix Multiplication C++ Program to Print Fibonacci Triangle Stack in C++ Maps in C++ Queue in C++ C++ Bitset C++ Algorithms Priority Queue in C++ C++ Multimap C++ Deque Function Pointer in C++ Sizeof() Operators in C++ C++ array of Pointers free() Vs delete in C Timsort Implementation Using C++ CPP Templates C++ Aggregation C++ Enumeration C++ Math Functions C++ Object Class C++ Queue Initialize Vector in C++ Vector in C++ C++ STL Components Function overloading in C++ C++ Maximum Index Problem C++ find missing in the second array C++ Program to find the product array puzzle C++ Program To Find Largest Subarray With 0 Sum C++ Program To Move All Zeros To The End Of The Array C++ Program to find the element that occurs once C++ Program to find the largest number formed from an array Constructor Vs Destructor C++ Namespaces C++ OOPs Concept C++ Static C++ Structs C++ Try-Catch C++ User Defined Exceptions C++ Virtual Destructor C++ vs C# Malloc() and new in C++ Palindrome Number Program in C++ Snake Code in C++ Splitting a string in C++ Structure Vs Class in C++ Virtual Function Vs Pure Virtual Function C++ Bidirectional Iterators C++ Forward Iterators C++ Iterators C++ Output Iterators C++ Range-based For Loop Converting string into integer in C++ LCM Program in C++ Type conversion in C++ Add two numbers using the function in C++ Advantage and disadvantage friend function C++ Armstrong Number Program in C++ ATM machine program in C++ using functions Binary to Decimal in C++ Bit Manipulation in C++ C++ Constructor C++ Dijkstra Algorithm Using the Priority Queue C++ int into String C++ Signal Handling Decimal to Binary in C++ Decimal to Hexadecimal in C++ Decimal to Octal in C++ Factorial Program in C++ Function in C++ Hexadecimal to Decimal in C++ Octal to Decimal in C++ Reverse a Number in C++ Structure Vs Class in C++ C++ Forward Iterators C++ Output Iterators C++ Prime number program Char Array to String in C++ Constructor Overloading in C++ Default arguments in C++ Different Ways to Compare Strings in C++ Dynamic Binding in C++ Program to convert infix to postfix expression in C++ SET Data Structure in C++ Upcasting and Downcasting in C++ Reverse an Array in C++ Fast Input and Output in C++ Delete Operator in C++ Copy elision in C++ C++ Date and Time C++ Bitwise XOR Operator Array of sets in C++ Binary Operator Overloading in C++ Binary Search in C++ Implementing the sets without C++ STL containers Scope Resolution Operator in C++ Smart pointers in C++ Types of polymorphism in C++ Exception Handling in C++ vs Java Const Keyword in C++ Type Casting in C++ Static keyword in C++ vs Java Inheritance in C++ vs Java How to concatenate two strings in C++ Programs to Print Pyramid Patterns in C++ swap() function in C++ Structure of C++ Program Stringstream in C++ and its applications rand() and srand() in C / C++ C++ Ternary Operator C++ Scope of Variables While Loop Examples in C++ Star pattern in C++ using For Loops For Loop Examples in C++ Do-While Loop Examples in C++ Top 5 IDEs for C++ That You Should Try Once Assertions in C/C++ C++ Convert Int to String Continue in C++ While loop Diamond Pattern in C++ using For Loop How to Reverse a String in C++ using Do-While Loop How to Reverse a String in C++ using For Loop How to Reverse a String in C++ using While Loop Infinite loop in C++ Loops in C++ Returning Multiple Values from a Function using Tuple and Pair in C++ wcscpy(), wcslen(), wcscmp() Functions in C++ Auto keyword in C++ C++ 11 vs C++ 14 vs C++ 17 C++ STL (Standard Template Library) Differences Between C Structures and C++ Structures Divide by Zero Exception in C++ Dynamic Constructor in C++ Dynamic Memory Allocation in C++ Find the Size of Array in C/C++ without using sizeof() function Floating Point Operations and Associativity in C, C++ and Java Hello World Program in C++ How to create a table in C++ How to Setup Environment for C++ Programming on Mac Implementation of a Falling Matrix in C++ Message Passing in C++ Pointer to Object in C++ Templates in C++ vs Generics in Java Ways to Copy a Vector in C++ What does Buffer Flush mean in C++ sort() function in C++ Structure Sorting (By Multiple Rules) in C++ Similarities between C++ and Java std::distance in C++

Binary to Decimal in C++

We must create a software to convert a binary number into an equivalent decimal value given a binary number as input.

Example:

// C++ program to convert binary to decimal
#include < iostream >
#include < bits/sdtc++.h >
#include < stdlib >
using namespace std; 
// Function to convert binary to decimal
int BinaryToDecimal ( int n )
{
	int number = n ;
	int decimal_value = 0 ; 
	// Initializing base value to 1, i.e 2^0
	int base = 1 ; 
	int temp = number ;
	while ( temp ) {
		int last_digit = temp % 10 ;
		temp = temp / 10 ; 
		decimal_value += last_digit * base ; 
		base = base * 2 ;
	}
	return decimal_value ;
}
// Driver program to test above function
int main ( )
{
	int number = 111 ; 
	cout << BinaryToDecimal ( num ) << endl ;
}

OUTPUT:

7

Explanation:

The goal is to extract the digits of a binary number starting with the rightmost digit and store them in a variable called decimal value. Multiply the digit with the suitable base (Power of 2) and add it to the variable decimal value when extracting digits from the binary integer. Finally, the decimal number will be stored in the variable decimal value. If the binary number is 111, decimal value equals 1*(2^2) + 1*(2^1) + 1*(2^0) which is equal to 7.

NOTE: The software only accepts binary values in the integer range. If you need to work with lengthy binary integers, such as 20 bits or 30 bits, you can store them in a string variable.

Storing binary values in string variables rather than integers

For example:

// C++ program to convert binary to decimal
// when input is represented as binary string.
#include < iostream >
#include < string >
#include < bits/sdtc++.h >
#include < stdlib >
using namespace std ; 
// Function to convert binary to decimal
int BinaryToDecimal ( string num )
{
	string number = num ;
	int decimal_value = 0 ; 
	// Initializing base value to 1, i.e 2 ^ 0
	int base = 1 ; 
	int length = num.length ( ) ;
	for ( int i = length - 1 ; i >= 0 ; i-- ) {
		if ( number [ i ] == '1' )
			decimal_value += base ;
		base = base * 2 ;
	}


	return decimal_value ;
}
// Driver program to test above function
int main ( )
{
	string number = "111" ;
	cout << BinaryToDecimal ( number ) << endl ;
}

OUTPUT:

7

Explanation:

In the above program it is using string to store the binary number i.e. 111 in the string number, and performing the same function as we did in the program using integer to store the binary number.

Using Pre-Defined Function

//C++ program to convert binary to decimal 
//using pre defined function
#include < iostream >
#include < bits/stdc++.h >
#include < stdlib >
using namespace std ; 
int main ( )
{
	char BinaryNumber [ ] = "111" ; 
	cout << stoi ( BinaryNumber , 0 , 2 ) ; 
	return 0 ;
}

OUTPUT:

7

Explanation:

In the above program, stoi function is a predefined function in C++, which helps in converting binary to decimal number in C++;

Another Example:

// C++ program to convert binary to decimal
#include < iostream >
#include < bits/stdc++.h >
#include < cmath >
using namespace std ; 
// function prototype
int Binarytodecimal ( long long ) ; 
int main ( ) {
  long long numver ;
  cout << "enter a binary number: " ;
  cin >> number ;
  cout << number << " in binary = " << Binarytodecimal ( number ) << " in decimal" ;
  return 0 ;
}
// function definition
int Binarytodecimal ( long long number ) {
  int decimal = 0 , i = 0 , remainder ; 
  while ( number != 0 ) {
    remainder = number % 10 ;
    number /= 10 ;
    decimal += rem * pow (2 , i ) ;
    ++i ;
  }
  return decimal ;
}

OUTPUT:

Enter a binary number: 111
111 in binary = 7 in decimal
……………………………………….
Process executed in 0.11 seconds
Press any key to continue.

Explanation:

The header file cmath has been included in the program to conduct mathematical calculations. We ask the user to provide a binary number that will be converted to decimal using the Binarytodecimcal ( ) method.

Let’s look at another example to properly understand the concept:

#include <iostream>
#include <cmath>
using namespace std;
long long Binarytodecimal (int); 
int main() {
  int n, bin;
  cout << "enter a decimal number: ";
  cin >> n;
  bin = Binarytodecimal(n);
  cout << n << " in decimal = " << bin << " in binary" << endl ;
  return 0;
}
long long Binarytodecimal(int n) {
  long long bin = 0;
  int rem, i = 1; 
  while (n!=0) {
    rem = n % 2;
    n /= 2;
    bin += rem * i;
    i *= 10;
  }
  return bin;
}

OUTPUT:

Enter a decimal number: 10
10 in decimal = 1010 in binary

Explanation:

In this above program we are using a while loop for our iteration in the function called Binarytodecimal.



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